| Prefix |
Meaning |
Examples |
| a-, an- |
without, lack of, not |
amoral, acellular, abyss, achromatic, anhydrous |
| ante- |
before, earlier, in front of |
antecedent, antedate, antemeridian, anterior |
| anti- |
against, opposite of |
anticlimax. antiaircraft, antiseptic, antibody |
| auto- |
self, same |
autopilot, autobiography, automobile, autofocus |
| circum- |
around, about |
circumvent, circumnavigate, circumscribe |
| co- |
with, together |
co-pilot, co-worker, co-exist, co-author |
| com-, con- |
together, with |
companion, commingle, contact, concentrate |
| contra-, contro- |
against, opposite |
contradict, contrast, contrary, controversy |
| de- |
down, off, away from |
devalue, deactivate, debug, degrade, deduce |
| dis- |
not, apart, away |
disappear, disagreeable, disbar, dissect |
| en- |
put into, cover with |
enclose, entangle, enslave, encase |
| ex- |
out of, from, former |
extract, exhale, excavate, ex-president |
| extra- |
beyond, outside, more than |
extracurricular, extramarital, extravagant |
| hetero- |
different, other |
heterosexual, heterodox, heterogeneous |
| homo-, homeo- |
same, alike |
homonym, homophone, homeostasis |
| hyper- |
over, more, beyond |
hyperactive, hypersensitive, hypercritical |
| il-, im-, in-, ir- |
not, without |
illegal, immoral, inconsiderate, irresponsible |
| in- |
in, into |
insert, inspection, infiltrate |
| inter- |
between, among |
intersect, interstellar, intervene, interpenetrate |
| intra-, intro- |
within, inside |
intravenous, intragalactic, introvert |
| macro- |
large, prominent |
macroeconomics, macrostructure, macrocosm |
| micro- |
very small |
microscope, microcosm, microbe |
| mono- |
one, single, alone |
monocle, monologue, monogamy, monotony |
| non- |
not, without |
nonentity, nonaggressive, nonessential, nonfiction |
| omni- |
all, every |
omniscient, omnivorous, omniscient, omnidirectional |
| post- |
after, behind |
postmortem, posterior, postscript, postoperative |
| pre-, pro- |
before, forward |
precede, predict, project, prologue |
| re- |
again |
reelect, readmit, resubmit |
| sub- |
under, lower |
submarine, subsidiary, substandard |
| sym-, syn- |
same time, together |
symmetry, symposium, synchronize, synapse |
| tele- |
from or over a distance |
telecommunications, telemedicine, television, telephone |
| trans- |
across, beyond, through |
transmit, transaction, translation, transfer |
| tri- |
three, every third |
tricycle, trimester, triangle, triathlon |
| un- |
not, lacking, opposite of |
unfinished, unskilled, ungraceful, unfriendly |
| uni- |
one, single |
unicorn, unicellular, unicycle, unilateral |
| up- |
to the top or north, higher/better |
upbeat, updo, upgrade, upload, uphill, upstage, upscale, up-tempo |