Most Common Prefixes

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A prefix is an affix which is placed before the stem of a word. Adding it to the beginning of one word changes it into another word.

Prefix (tiền tố) là phần thêm phía trước của một từ có chức năng làm cho nghĩa của từ đó khác đi so với từ gốc.

Prefix             Meaning           Key Word

anti- against antifreeze
de- opposite defrost
dis-* not, opposite of disagree
en-, em- cause to encode, embrace
fore- before forecast
in-, im- in infield
in-, im-, il-, ir-* not injustice, impossible
inter- between interact
mid- middle midway
mis- wrongly misfire
non- not nonsense
over- over overlook
pre- before prefix
re-* again return
semi- half semicircle
sub- under submarine
super- above superstar
trans- across transport
un-* not unfriendly
under- under undersea

*Most frequent. The four most frequent prefixes account for 97 percent of prefixed words in printed school English.