Abbreviation, n.
Etymology: [LL. abbreviatio: cf. F. abbréviation.]
1. The act of shortening, or reducing.
2. The result of abbreviating; an abridgment. Tylor.
3. The form to which a word or phrase is reduced by contraction and omission; a letter or letters, standing for a word or phrase of which they are a part; as, Gen. for Genesis; U.S.A. for United States of America.
4. (Mus.)
1 more senses
One dash, or more, through the stem of a note, dividing it respectively into quavers, semiquavers, or demi-semiquavers. Moore.
Shades of meaning
An abbreviation is a shortening by any method; a contraction is a reduction of size by the drawing together of the parts. A contraction of a word is made by omitting certain letters or syllables and bringing together the first and last letters or elements; an abbreviation may be made either by omitting certain portions from the interior or by cutting off a part; a contraction is an abbreviation, but an abbreviation is not necessarily a contraction; rec't for receipt, mdse. for merchandise, and Dr. for debtor are contractions; they are also abbreviations; Am. for American is an abbreviation, but not a contraction. Abbreviation and contraction are used of words and phrases, abridgment of books, paragraphs, sentences, etc. Compare abridgment.