Definition of "Later" :

adjective: coming at a subsequent time or stage

adjective: at or toward an end or late period or stage of development

"A later symptom of the disease."

adverb: happening at a time subsequent to a reference time

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

adverb: at some eventual time in the future

"I'll see you later."

adverb: comparative of the adverb late'

"He stayed later than you did."