To make briefer, shorten.
Abbreviation for abbreviate is Abbr.
Abbreviate is such a long word for what it means.
To shorten a sentence, for instance LOL is short for Laugh Out Loud.
Same as FYI is short for For Your Information and etc etc etc
Stuff like that are ALL abbreviations.
LOL, LMAO, ILY and more are all abbreviations.
DNA = Do Not Abbreviate
Even though I do it...LOTS