Definitions of later:

• adverb:   comparative of the adverb `late'

  Example: "He stayed later than you did"

• adverb:   happening at a time subsequent to a reference time

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

• adverb:   at some eventual time in the future

  Example: "I'll see you later"

• name:  A surname (very rare: popularity rank in the U.S.: #37558)