later | Origin and meaning of later by Online Etymology Dictionary

later (adv.)

happening at a time subsequent to a reference time;

he's going to the store but he'll be back here later

Synonyms: subsequently / afterwards / afterward / after / later on

later (adv.)

at some eventual time in the future;

I'll see you later

Synonyms: by and by

later (adv.)

comparative of the adverb `late';

he stayed later than you did

later (adj., adv.)