To fix or put before; place in front; put at the beginning.To fix beforehand; set or appoint in advance; settle beforehand.n. A word or syllable, or a number of syllables, rarely more than two, and usually one (sometimes reduced to a single consonant not forming a syllable), affixed to the beginning of a word, to qualify its meaning or direct, its application: opposed to suffix or postfix, a like addition at the end of a word.n. The act of prefixing; prefixion.