What is the meaning of Abbreviation?

The result of shortening or reducing; abridgment.

A shortened or contracted form of a word or phrase used to represent the whole, using omission of letters, and sometimes substitution of letters, or duplication of initial letters to signify plurality, including signs such as +, =, @. (The addition of quotations indicative of this usage is being sought:)

The process of abbreviating.

A notation used in music score to denote a direction, as pp or mf.

One or more dashes through the stem of a note, dividing it respectively into quavers, semiquavers, demisemiquavers, or hemidemisemiquavers.

Any convenient short form used as a substitution for an understood or inferred whole.

Loss during evolution of the final stages of the ancestral ontogenetic pattern.

Reduction to lower terms, as a fraction.

Source: wiktionary.org