a- in, on, of, to abed - in bed a-, ab-, abs- from, away abrade - wear off, absent - away, not present a-, an- lacking, not asymptomatic - showing no symptom, anaerobic - able to live without air ad-, ac-, af-, ag, al-, an-, ap, ar, as-, at- to, toward accost - approach and speak to, adjunct - something added to, aggregate - bring together ambi-, amphi- around, both ambidextrous - using both hands equally, amphibious - living both on land and in water ana- up, again, anew analyze - loosen up, break up into parts of another word, anagram - word spelled by mixing up letters ante- before antediluvian - before the flood anti- against antiwar - against war arch- first, chief archetype - first model auto- self automobile - self-moving vehicle bene-, ben- good, well benefactor - one who does good deeds bi- two bilateral - two-sided circum- around circumnavigate - sail around com-, co-, col-, with, together concentrate - bring closer together, cooperate - work with, collapse - fall together contra-, contro-, counter- against contradict - speak against, counterclockwise - against the clock de- away from, down, opposite of detract - draw away from demi- half demitasse - half cup di- twice, double dichromatic - having two colors dia- across, through diameter - measurement across dis-, di- not, away from dislike - to not like, digress - turn away from the subject dys- bad, poor dyslexia - poor reading equi- equal equivalent - of equal value ex-, e-, ef- from, out expatriate - one who lives outside his/her native country, emit - send out extra- outside, beyond extraterrestrial - from beyond the earth fore- in front of, previous forecast - tell ahead of time, foreleg - front leg geo- earth geography - science of the earth's surface homo- same, like homophonic - sounding the same hyper- too much, over hyperactive - overly active hypo- too little, under hypothermia - state of having too little body heat in-, il-, ig-, im-, ir-, not innocent - not guilty, ignorant - not knowing, illogical - not logical, irresponsible - not responsible in-, il-, im-, ir- on, into, in impose - place on, invade - go into inter- between, among interplanetary - between planets intra-, intro- within, inside intrastate - within a state mal-, male- bad, wrong, poor maladjust - adjust poorly, malevolent - ill wishing mis- badly, wrongly misunderstand - understand wrongly mis-, miso- hatred misogyny - hatred of women mono- single, one monorail - train that runs on a single rail neo- new neolithic - of the New Stone Age non- not nonentity - a nobody ob- over, against, toward obstruct - stand against omni- all omnipresent - present in all places pan- all panorama - a complete view peri- around, near periscope - device for seeing all around poly- many polygonal - many sided post- after postmortem - after death pre- before, earlier than prejudice - judgment in advance pro- in favor of, forward, in front of proceed - go forward, prowar - in favor of war re- back, again rethink - think again reimburse - pay back retro- backward retrospective - looking backward se- apart, away seclude - keep away semi- half semiconscious - half conscious sub-, suc-, suf-, sug-, sus- under, beneath subscribe - write underneath, suspend - hang down, suffer - undergo super- above, greater superfluous - overflowing, beyond what is needed syn-, sym-, syl-, sys- with, at the same time synthesis - a putting together tele- far television - machine for seeing far trans- across transport - carry across distance un- not uninformed - not informed vice- acting for, next in rank to viceroy - one acting for the king