PART A — PREFIXES (Grouped by What They Signal)

Prefixes are the fastest payoff in this entire guide, because there are barely forty of them worth knowing well, and they attach to hundreds of roots each. A prefix rarely changes a word's part of speech — it changes its direction, degree, or polarity. Learn a prefix once and it works on every root it touches, forever. Read each group below, then immediately try to add one more example of your own to every row before moving on — that small act of production is worth more than reading five extra rows passively.

A1. Prefixes of Negation / Absence

Prefix	Meaning	Examples
a-, an-	without	amoral, atypical, anonymous, apathy, asymmetric, atheist, anaerobic, achromatic
dis-	not, reverse of, apart	disqualify, disinterested, disband, disavow, disenfranchise, dissuade, disconcert, disparage
in-/im-/il-/ir-	not	inaccurate, impossible, illegal, irregular, immaterial, indecent, illegible, irreversible
non-	not (neutral, no judgment implied)	non-negotiable, nondescript, nonchalant, non-partisan, non-committal, nonentity
un-	not, reverse of	unbiased, unravel, unassuming, uncouth, unwitting, unfeigned, unrelenting
mis-	wrongly, badly	misinterpret, miscalculate, misnomer, misgiving, miscreant, misconstrue, misappropriate
de- (negating sense)	remove, undo	defuse, dethrone, devalue, decommission, defrost, demystify
anti-	against, opposing	antibody, antidote, antisocial, antithesis, antipathy, antiseptic

Bridge word: impossible → im- (not) + possible. Once "im-" clicks as "not," impartial, impatient, imperfect, immature, immobile all fall into place without separate memorisation. Notice how in- silently changes its spelling (assimilates) to match the next sound: before m/p/b it becomes im- (impossible), before l it becomes il- (illegal), before r it becomes ir- (irregular). This is not random — Latin prefixes routinely absorb the sound of the letter that follows, purely to make the word easier to pronounce. Recognising this saves you from thinking il-, ir-, im- are separate prefixes to memorise; they're all just in- in disguise.

Confusable pair — un- vs in-/dis-: all three can mean "not," so exam options often dangle a wrong-prefix version of a correct word as a distractor (e.g., unpossible is not a word; impossible is). There's no fully reliable rule, but a strong tendency helps: un- attaches comfortably to native English and participial adjectives (unhappy, unproven, unassuming), while in-/im-/il-/ir- attaches almost exclusively to Latinate roots (inaccurate, impossible, illegible). dis- leans toward reversing an action or relationship rather than negating a static quality (disagree, disconnect, disqualify — actions — versus unhappy, inaccurate — states). When in doubt, trust your ear over the rule: native speakers absorb these collocations long before they can explain them, and exam-setters rely on exactly that instinct.

A2. Prefixes of Direction / Position

Prefix	Meaning	Examples
ab-/abs-	away from	abstain, abdicate, aberration, abscond, abstract, absolve, abnormal
ad- (and ac-, af-, ag-, al-, an-, ap-, ar-, as-, at-)	toward, to	adhere, adjacent, adept, accede, affix, aggravate, allude, annex, apprehend, arrogate, assimilate, attain
circum-	around	circumvent, circumnavigate, circumspect, circumscribe, circumference, circumlocution
de-	down, away, reversal	descend, deface, devalue, depose, decline, deduct, derail
ex-/e-/ef-	out, former, thoroughly	exodus, exile, ex-president, emit, evoke, eject, efface, extricate
inter-	between, among	interject, interlude, intersperse, intercede, interrogate, interminable
intra-/intro-	within	introvert, intramural, intravenous, introspect, intrastate
peri-	around	perimeter, periscope, peripheral, periphrasis
sub- (and suc-, suf-, sug-, sup-, sus-)	under, below	subordinate, submerge, subterranean, succumb, suffuse, suggest, suppress, sustain
super-/supra-	above, beyond	supersede, superfluous, supervise, superimpose, supranational, superlative
trans-	across, beyond	transcend, transient, transmute, transgress, transpose, translucent
ob- (and oc-, of-, op-)	against, toward, in the way	obstruct, obstinate, occlude, offend, oppose, obviate

Bridge word: supersede → super- (above) + sede (sit) — literally "to sit above" another, hence "to replace or override." This one root-piece sede/sid (sit) also gives sedentary (sitting a lot), reside (sit back, dwell), subside (sit down, settle), preside (sit in front, in charge), insidious (sitting in wait, treacherous).

Direction-and-position prefixes are the ones most likely to appear stacked two at a time in genuinely long exam words — a word like circumnavigate or intransigent is really telling you where something is happening before you even reach the root that tells you what is happening. Get comfortable reading them left to right as a sequence of spatial instructions, the way you'd read a set of directions on a map.

A3. Prefixes of Quantity / Degree

Prefix	Meaning	Examples
mono-/uni-	one	monopoly, unanimous, monotonous, monolith, unilateral, unison, monogamy
bi-/di-	two	bilateral, dichotomy, bifurcate, biennial, diverge, duplicity
tri-	three	triumvirate, trivial (originally "where three roads meet"), tripartite, trilogy
multi-/poly-	many	multifaceted, polyglot, multitude, polygamy, multifarious, polymath
omni-	all	omnipotent, omniscient, omnivore, omnipresent, omnibus
semi-/hemi-	half	semicircle, hemisphere, semiconscious, semiautonomous
equi-	equal	equidistant, equanimity, equivalent, equivocal
hyper-	excessive, over	hyperbole, hypersensitive, hyperactive, hyperinflation, hypertension
hypo-	insufficient, under	hypothermia, hypoactive, hypoglycemia, hypocrisy (literally "under-judging," i.e. play-acting)
ultra-	beyond, extremely	ultraviolet, ultramodern, ultraconservative, ultrasonic
pan-	all, entire	pandemic, panacea, panorama, pan-African

Confusable pair — hyper- vs hypo-: these look almost identical and are opposites, which makes them a favourite exam trap. Hyper- means "over/excessive" (hypertension = high blood pressure); hypo- means "under/insufficient" (hypotension = low blood pressure). Anchor them physically: hyper is a child bouncing off the walls with too much energy; hypo is someone slumped and low on it. The two are never interchangeable, and mixing them up in a medical or economic-vocabulary passage is one of the most common errors aspirants make.

A4. Prefixes of Time

Prefix	Meaning	Examples
ante-/pre-	before	antecedent, premonition, precede, antebellum, precursor, antenatal
post-	after	posthumous, postpone, post-mortem, postscript, posterity
neo-	new	neonatal, neophyte, neologism, neoclassical
retro-	backward	retrospect, retrograde, retroactive, retrofit
re-	again, back	reiterate, revert, recur, rejuvenate, reconvene, resurgent
paleo-/archaeo-	ancient, old	paleolithic, paleontology, archaeology

Time-based prefixes matter disproportionately for Reading Comprehension, because they're what a passage uses to signal sequence — whether an event happened before the main clause, after it, or is recurring. Missing a retro- or a post- is one of the quietest ways to misread the timeline of a passage and answer a "which of the following happened first" question wrong.

A5. Prefixes of Togetherness / With

Prefix	Meaning	Examples
co-/con- (and col-, com-, cor-)	together, with	cooperate, coalesce, congregate, collaborate, compile, correlate, coherent, concur
syn-/sym-	together, at the same time (Greek)	synthesis, symphony, synchronise, sympathy, symbiosis, syndrome
assoc- (via ad- + soci)	joined to	associate, dissociate

Bridge word: cooperate → co- (together) + oper (work). Once co- is anchored as "together," coexist, coincide, coalesce (grow together), cohesive (sticking together) all become transparent. Note that Greek prefers syn-/sym- for this same idea, which is why symphony (sounds together) and synchronise (time together) feel Greek rather than Latin — see the Greek-vs-Latin section later in this guide.

A6. Prefixes of Opposition / Against

Opposition prefixes are semantically close to negation prefixes (A1) but carry an extra ingredient: negation says "not X"; opposition says "actively working against X." Unfriendly just means not friendly; anti-friendly would suggest actively campaigning against friendliness — which is why English rarely uses anti- on simple everyday adjectives and reserves it for stances, movements, and forces (antibiotic, antihero, antiwar). Keeping this distinction in mind helps you choose between an un-/in- option and an anti-/contra- option when both appear as choices in the same question.

Prefix	Meaning	Examples
anti-	against, opposing	antithesis, antipathy, antagonist, anticlimax, antiseptic
contra-/counter-	against, opposite	contradict, contravene, counteract, counterproductive, contraband
ob-/oppos-	against, in the way	obstruct, obstacle, oppose, opposition, obstinate

Bridge word: contradict → contra- (against) + dict (say) — literally "to say against." Once contra- is fixed, counterproductive (working against production) and contravene (come against, violate) are just the same idea wearing a different costume.

A7. Prefixes of Wrongness / Falseness

This group is subtly different from pure negation: malfunctioning is not simply "not functioning" (that would just be non-functional) — it implies functioning badly, in a faulty or harmful way. The same distinction separates pseudo- from un-: a pseudonym is not "not a name," it is a name that pretends to be someone's real one. Watch for this shade of meaning in RC passages — a word carrying mal-, pseudo-, or dys- usually implies deception or malfunction, not mere absence, which changes the tone of the sentence it appears in.

Prefix	Meaning	Examples
mal-/male-	bad, wrongly	malfunction, malnourished, malevolent, malpractice, maladroit, malign
pseudo-	false, fake (Greek)	pseudonym, pseudoscience, pseudointellectual, pseudo-secular
dys-	difficult, faulty, abnormal (Greek)	dysfunctional, dyslexia, dystopia, dyspepsia
mis-	wrongly, badly	(see A1 — misinterpret, miscreant, misappropriate)

Bridge word: malfunction → mal- (bad) + function. Note how dys- (Greek: difficult/abnormal) and mal- (Latin: bad) cover almost the same emotional territory but come from different word-families — dystopia is the opposite of utopia (a "bad-place"), while malevolent is "wishing bad things" (mal + volent, wishing).

A8. Prefixes of Self

The smallest group in Part A, but a reliable one, because auto- almost never means anything else — unlike prefixes such as in- or de- which do double duty across several senses, auto- consistently signals "done by or to oneself" across every field: biology (autoimmune), politics (autocracy), machinery (automatic), and writing (autobiography). If you spot auto- in an unfamiliar word, you can commit to "self" with far more confidence than you can commit to a guess for most other prefixes.

Prefix	Meaning	Examples
auto-	self (Greek)	autobiography, autonomous, automaton, autocracy, autograph, autopsy (literally "seeing with one's own eyes")
self-	self (native English, not Latin/Greek but worth grouping here)	self-effacing, self-righteous, self-sufficient
ego-	I, self (Latin)	egocentric, egotism, egomaniac

Bridge word: autonomous → auto- (self) + nom (law/rule) — literally "self-ruled," i.e. independent. This anchors autocracy (self-rule by one person, i.e. dictatorship) and automaton (a thing that moves by itself).

A9. Prefixes of Order & Sequence

A small but exam-useful group, easy to confuse with the time prefixes in A4 — the difference is that these describe rank or position in a series rather than when something happens.

Prefix	Meaning	Examples
prim-/proto-	first	primary, primeval, prototype, protagonist, primordial
penult-	second-last	penultimate
ultim-	last	ultimatum, penultimate, ultimate
sub-/infra- (in rank)	lower in rank	subordinate, subaltern, infrastructure, infra dig
supra-/super- (in rank)	higher in rank	superior, supremacy, supra-national

Bridge word: prototype → proto- (first) + type (model) — the first model from which later versions are copied. Once anchored, protagonist (the first/leading actor) and protocol (originally, the first sheet glued to a document, hence "the correct procedure") stop feeling unrelated.

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