ASVAB Word Knowledge — Root Words, Prefixes, and Suffixes

ABATE means to reduce in degree or intensity; to lessen or decrease. Example: 'The storm abated by evening.' The Latin root 'ab-' means away from, and 'batere' means to beat — literally to beat down or away. ASVAB Word Knowledge questions test vocabulary recognition. The format gives a word and asks for its closest meaning (synonym). Strategies: (1) Look for the word in your own knowledge; (2) Try to recall the word in context — where have you heard it used?; (3) Look at root words, prefixes, and suffixes for clues; (4) Use process of elimination on clearly wrong choices; (5) If stuck, guess and move on (no penalty for wrong answers on ASVAB). Related: ABATEMENT (noun form, the act of reducing); UNABATED (continuing without lessening). The opposite of abate is increase, intensify, or amplify.

BENEVOLENT means showing kindness, generosity, or good will. From Latin 'bene' (good) + 'volens' (wishing). Example: 'The benevolent donor gave millions to charity.' Recognizing the 'bene-' prefix is a strong strategy: it almost always indicates something positive. Other 'bene-' words: BENEFIT (something good or helpful), BENEFICIAL (helpful, favorable), BENEFACTOR (a person who gives help), BENIGN (not harmful). The opposite prefix 'mal-' means bad: MALEVOLENT (wishing harm — the antonym of benevolent), MALICE, MALIGNANT, MALADY. Knowing roots and prefixes lets you decode unfamiliar words. The ASVAB rewards systematic vocabulary study; consistent reading of varied material (newspapers, books, military publications) builds the vocabulary needed for high scores.

CANDID means open, honest, and straightforward in expression — not concealing thoughts or feelings. Example: 'She gave a candid answer to the difficult question.' Synonyms: frank, honest, forthright, blunt, sincere. Antonyms: secretive, evasive, dishonest, deceptive. The word also has a secondary meaning — 'candid photo' means an unposed, spontaneous picture (not formal or arranged). The Latin root 'candidus' means white or pure, suggesting clarity and openness. Related word: CANDOR (the quality of being open and honest). Don't confuse with: CANDIDATE (someone who runs for office), which has a different etymology related to white togas worn by Roman office-seekers. ASVAB tip: when two answer choices seem similar, consider the precise shade of meaning. 'Frank' and 'truthful' are close but not identical — frank emphasizes openness in saying difficult things.

FLEETING means passing swiftly; lasting only a short time. Context clues: 'passed before she could react' suggests the moment was very brief. From Old English 'fleotan' (to flee), related to fleet (fast-moving). Example: 'A fleeting smile crossed his face.' Synonyms: brief, momentary, transient, ephemeral, short-lived. Antonyms: lasting, enduring, permanent, prolonged. Context-clue strategy on the ASVAB: (1) Read the sentence carefully; (2) Look for hints about whether the word is positive or negative; (3) Try substituting each answer choice into the sentence — which makes sense?; (4) Consider the tone and other vocabulary around the word. The other choices fail: 'pleasant' doesn't fit (a pleasant moment can last); 'important' is contradicted (you wouldn't miss it); 'repeated' contradicts 'passed.'

MITIGATE means to make less severe, serious, or painful. Example: 'Medications can mitigate the symptoms.' From Latin 'mitigare' (to soften or ripen), with 'mitis' meaning soft or mild. Synonyms: alleviate, lessen, reduce, moderate, ease, soften. Antonyms: aggravate, worsen, intensify, exacerbate. Common collocations: 'mitigate risk' (in business and military planning); 'mitigating circumstances' (in legal contexts, factors that reduce blame or punishment). Related: MITIGATION (the act or process of mitigating). Don't confuse with: MILITATE (to have force as evidence — 'the facts militate against his theory'); IMITATE (to copy). These three words sound similar but have very different meanings — ASVAB sometimes presents distractors that exploit such confusion. Memorizing word families and being precise about pronunciation helps avoid these errors.

The prefix 'pre-' means before. PRECEDE = go before. Examples of 'pre-' words: PREVIEW (view before), PRECAUTION (caution before), PREDICT (say before — i.e., forecast), PREVENT (come before — i.e., stop before it happens), PREVIOUS (before now), PRELIMINARY (before the main event). Knowing common prefixes is one of the highest-leverage ASVAB strategies because so many English words use them. Major prefixes: PRE- (before); POST- (after); ANTE- (before, like antecedent); ANTI- (against, like antibiotic); SUB- (under); SUPER- (above); INTER- (between); INTRA- (within); EX- (out of); IN- (in OR not, depending on context); UN- (not); RE- (again or back); DIS- (not or apart); MIS- (badly or wrongly); MAL- (bad); BENE- (good); MICRO- (small); MACRO- (large); MULTI- (many); UNI- (one); BI- (two); TRI- (three). Mastering prefixes lets you decode unfamiliar words on the test.

The Latin root 'spec' (or 'spect') means to look or see. INSPECT means to look into; SPECTATOR is one who looks on. Other 'spec' words: SPECTACLE (something to look at), PROSPECT (something seen ahead, future possibility), RETROSPECT (looking back), CIRCUMSPECT (looking around — i.e., cautious), SUSPECT (looking under — i.e., having doubt), RESPECT (looking back at — i.e., regard), INTROSPECT (looking inward), CONSPICUOUS (clearly visible), PERSPECTIVE (a view). Major Latin roots: spec (see), aud (hear, like AUDIO and AUDIENCE), tact/tang (touch, like TACTILE and TANGIBLE), dict (say, like DICTATE and PREDICT), scrib/script (write, like INSCRIPTION and PRESCRIBE), port (carry, like TRANSPORT and IMPORT), mit/miss (send, like TRANSMIT and EMISSION), graph/gram (write or draw, like AUTOGRAPH and DIAGRAM), bio (life), geo (earth), phon (sound), photo (light), chrono (time), therm (heat). Greek and Latin roots together unlock a huge portion of English vocabulary.

DILIGENT means showing careful and persistent effort; hardworking. Example: 'A diligent student studies regularly and thoroughly.' Synonyms: industrious, hardworking, conscientious, assiduous, attentive, careful, painstaking. Antonyms: lazy, negligent, careless, sloppy. Related: DILIGENCE (noun — careful and persistent work or effort); DILIGENTLY (adverb). The word comes from Latin 'diligere' (to love or value, by extension to attend to carefully). Common collocations: 'due diligence' (research before a decision, especially in business), 'diligent search,' 'diligent worker.' On the ASVAB, vocabulary related to work ethic and character traits is common: PROCRASTINATE (to delay), PERSEVERE (to continue despite difficulty), RESILIENT (able to recover from hardship), TENACIOUS (holding fast, determined), CONSCIENTIOUS (governed by conscience, thorough), METICULOUS (showing great attention to detail).

OMINOUS means giving the impression that something bad or unpleasant is going to happen; threatening. Example: 'Dark, ominous clouds gathered before the storm.' From Latin 'omen' (a sign, especially a sign of misfortune). Synonyms: threatening, sinister, menacing, foreboding, portentous, baleful. Antonyms: encouraging, promising, auspicious, propitious, favorable. Related words: OMEN (a sign foreshadowing future events), PREMONITION (a forewarning, especially of something unpleasant), FOREBODE (to indicate beforehand, usually negative). Don't confuse with: NOMINAL (in name only); OMNIPOTENT (all-powerful — from 'omni-' meaning all, not 'omen'). The negative connotation of ominous is important — choices like 'ordinary' (neutral) or 'pleasant' (positive) cannot be correct. When you recognize a word is clearly negative or positive, you can eliminate answer choices with the opposite connotation immediately.

ILLICIT means not legally permitted; forbidden by law, rules, or custom. Context clue: 'corrupt politician accepting payments from corporations' — clearly negative and likely illegal. From Latin 'in-' (not) + 'licitus' (allowed). Synonyms: illegal, unlawful, forbidden, prohibited, illegitimate. Antonyms: legal, lawful, permitted, sanctioned. Don't confuse with: ELICIT (verb — to draw out or evoke, like 'elicit a response') — sounds similar but completely different meaning and part of speech. Other 'il-' (or 'in-' or 'im-' — variations of the same prefix meaning 'not') words: IMPOSSIBLE, IRREGULAR, INCAPABLE, ILLOGICAL, IRRELEVANT. The prefix 'il-' is used before 'l' (illegal, illogical, illicit); 'ir-' before 'r' (irregular, irrelevant); 'im-' before 'b/m/p' (impossible, immature, imprudent); 'in-' before vowels and other consonants (incapable, insane). All mean 'not.'