1 (grammar) a letter or group of letters added to the beginning of a word to change its meaning, such as un- in unhappy and pre- in preheat
compareAFFIX, SUFFIX
2 a word, letter or number that is put before another:
Car insurance policies have the prefix MC (for motor car).
3 (old-fashioned) a title such as Dr or Mrs used before a person's name
verb [VN] ~ A to B
