later

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adverb Subsequently; afterward. Often used with on.
• interjection Informal Used to express goodbye.

from The Century Dictionary.

• At a subsequent time or period; afterward; hereafter: also used with (redundant) on: as, I will see you later; it may be done later on.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Compar. of late, a. & adv.
• noun A brick or tile.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adverb comparative form of late: more late
• adverb Afterward in time (used with than when comparing with another time).
• adverb At some unspecified time in the future.
• adjective comparative form of late: more late
• adjective Coming afterward in time (used with than when comparing with another time).
• adjective At some time in the future.
• interjection slang See you later; goodbye.
• interjection slang Dismissive term to minimize importance of an annoying persons.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective at or toward an end or late period or stage of development
• adverb happening at a time subsequent to a reference time
• adjective coming at a subsequent time or stage
• adverb comparative of the adverb `late'
• adverb at some eventual time in the future