Prefixes

Prefixes, their meaning, and examples Please Note: Where the word is supposed to be, that is where the definition of the prefix is. Where the definition is, is where the prefix and the example of the prefix in a word is located.
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from, away from
ab-
Example: abnormal, abduct, absent, abhor
to; notion toward; addition to
ad-
Example: adapt, addict, adhere, admit
air
aero-
Example: aerobic, aerobiology, aerospace
both, around
amphi-
Example: amphibian, amphitheater
not
an-
Example: anarchy, anesthesia, anonymous
before
ante-
Example: antebellum, antecede, antedate
against; opposite; reverse
anti-
Example: antiaircraft, antifreeze, antibiotics
to; nearness to
ap-
Example: approximate, appoint, approach
self
auto-
Example: automatic, autograph, autobiography
good
bene-
Example: benediction, benefactor, benevolent
two
bi-
Example: bifacial, bifocal, biennial
around
circum-
Example: circumnavigate, circumference
together
co-, con-
Example: coauthor, cooperate, confront, confound
against
contra-
Example: contradict, contradistinguish, contrary
opposite of; away from; undo
de-
Example: deactivate, deform, degrade, deplete, descend
opposite
dis-
Example: disagree, disarm, discontinue, dishonest
out; beyond; away from; former
ex-
Example: excel, exclude, exhale, exile
outside; beyond; besides
extra-
Example: extraordinary, extracurricular
not
for-
Example: forbid, forget, forgo
before
fore-
Example: forecast, foreword, forestall, forethought
more than normal; too much
hyper-
Example: hyperactive, hypercritical, hypertension
not
il-
Example: illegal, illegible, illiterate, illlogical
into
im-
Example: immediate, immerse, immigrate, import
not
im-
Example: imbalance, immature, immobilize
not, go into
in-
Example: inaccurate, inactive, inhabit
among, between
inter-
Example: interaction, intercede, interchange
within
intra-
Example: intramural, intrastate, intravenous
not
ir-
Example: irredeemable, irregular, irresponsible
wrong, bad
mal-
Example: maladjusted, malfunction, malice
wrong; bad; no; not
mis-
Example: misfire, misbehave, misconduct
not; opposite of
non-
Example: noncommittal, nonconductor, nonpartisan
against
ob-
Example: obstacle, obstinate, obstruct, object
through
per-
Example: percolate, percieve
after
post-
Example: postglacial, postgraduate, posterior
before
pre-
Example: preamble, prearrange, precaution
before; for; in support of
pro-
Example: prognosis, program, prologue, prophet
forward
pro-
Example: proceed, produce, proficient, progress
back; again
re-
Example: recall, recede, reflect, repay
backward
retro-
Example: retroactive, retrospect, retrocede
apart
se-
Example: secure, secede, secession
of the self
self-
Example: self-taught, self-worth, self-respect, selfish
half; partly
semi-
Example: semicircle, semiformal, semitrailer
under; beneath
sub-
Example: subcontract, subject, submarine, submerge
over
super-
Example: superabound, superabundant, superhuman
over; above
sur-
Example: surcharge, surface, surmount, surpass
across; over
trans-
Example: transatlantic, transcend, transcribe, transfer
extremely
ultra-
Example: ultraliberal, ultramodern, ultrasonic
not
un-
Example: unable, uncomfortable, uncertain, unhappy