The word “Language” comes from the Latin word “lingua” came the early French“langue”, meaning “tongue, language”.

Definition of language: Language is a system of communication by written or spoken words, which is used by the people of a particular country or area.

A few words here as to the authority upon which grammar rests.

Source_ http://knowledge.itinfoworld.com/what-is-language/

Abbreviation is the short form of a word or phrase to be used to represent the full form. Abbreviations letter or group of letters used in writing, printing, and speech to represent a word or phrase in shortened form. Abbreviations are used to save space and time. The most common are arbitrary signs or initial letters for the words themselves.

Shortened word forms have been in use since antiquity, and many current abbreviations have come from Latin. Most of the arts and sciences use symbols as abbreviations; they are universally understood.
Why use abbreviation?
Various kinds of Abbreviation:

There are four main kinds of abbreviations:

1. Shortenings Abbreviation,

2. Contractions Abbreviation,

3. Initialisms Abbreviation,

4. Acronyms Abbreviation,

Read more: http://knowledge.itinfoworld.com/what-is-abbreviation/