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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
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