to shorten (a word or phrase) by omitting letters, substituting shorter forms, etc., so that the shortened form can represent the whole word or phrase, as ft. for foot, ab. for about, R.I. for Rhode Island, NW for Northwest, or Xn for Christian.

to reduce (anything) in length, duration, etc.; make briefer: to abbreviate a speech.

to use abbreviations.

to shorten (a word or phrase) by contraction or omission of some letters or words

to shorten (a speech or piece of writing) by omitting sections, paraphrasing, etc