What does abbreviation mean?
The definition of abbreviation
Ab*bre`vi*a”tion, n.
Etym: [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.)
One dash, or more, through the stem of a note, dividing it respectively into quavers, semiquavers, or demi-semiquavers. Moore.