Prefixes
a, an- anarchy, anecdote, aside
aer, aero- aerodrome, aeronautics, aerobic
ante- anteroom, antebellum, antedate
anti- antibody, antifreeze, antiknock
auto- autograph, autobiography, autotroph
bi- bisexual, bifacial, bifarious
bio- biography, biopic, biolysis
cent, centi- centiliter, centipede, centare
circum- circumference, circumjacent, circumstance
co- coadjutor, cohabit, cognate
com, con, col, cor- combine, connection, correlate
contra/contro- contraceptive, contradistinction, contrabass
counter- countermand, counterfoil, counterbalance
de- degrade, detract, derange
ex- ex-president, ex-wife, ex-member
extra- extrajudicial, extraterritorial, extra-atmospheric
fore- forehead, forecast, foreman
in- incredible, inpatient, insincere
in, il, im, ir- illegal, imperfect, irregular
inter- intercept, interest, intercom
intra- intramural, intravenous, intramedullary
kilo- kilometer, kilowatt, kiloliter
mal- malapert, malfunction, malcontent
mid- midday, midbrain, mid-April
milli- millipede, millimeter, mllisecond
mini- minigun, minicalculator, miniboom
mis- miscalculation, mistrust, mistrial
multi- multicolored, multiply, multimillion
non- nonprofessional, nonpayment, nonsexist
out- outcast, outcome, outside
over- overlap, overfull,overboard
post- postpone, postscript, postfix
pre- preseason, preschool, prepay
pro- provision, proceed, produce
trans- transvalue, transisthmian, transempirical
tri- triatomic, triacid, trigon
un- unfair, unseen, unable
uni- unicycle, universe, unisexual
aer, aero- aerodrome, aeronautics, aerobic
ante- anteroom, antebellum, antedate
anti- antibody, antifreeze, antiknock
auto- autograph, autobiography, autotroph
bi- bisexual, bifacial, bifarious
bio- biography, biopic, biolysis
cent, centi- centiliter, centipede, centare
circum- circumference, circumjacent, circumstance
co- coadjutor, cohabit, cognate
com, con, col, cor- combine, connection, correlate
contra/contro- contraceptive, contradistinction, contrabass
counter- countermand, counterfoil, counterbalance
de- degrade, detract, derange
ex- ex-president, ex-wife, ex-member
extra- extrajudicial, extraterritorial, extra-atmospheric
fore- forehead, forecast, foreman
in- incredible, inpatient, insincere
in, il, im, ir- illegal, imperfect, irregular
inter- intercept, interest, intercom
intra- intramural, intravenous, intramedullary
kilo- kilometer, kilowatt, kiloliter
mal- malapert, malfunction, malcontent
mid- midday, midbrain, mid-April
milli- millipede, millimeter, mllisecond
mini- minigun, minicalculator, miniboom
mis- miscalculation, mistrust, mistrial
multi- multicolored, multiply, multimillion
non- nonprofessional, nonpayment, nonsexist
out- outcast, outcome, outside
over- overlap, overfull,overboard
post- postpone, postscript, postfix
pre- preseason, preschool, prepay
pro- provision, proceed, produce
trans- transvalue, transisthmian, transempirical
tri- triatomic, triacid, trigon
un- unfair, unseen, unable
uni- unicycle, universe, unisexual