Use later when referring to time. Use latter when referring to the second of two persons or things mentioned previously. See also: Last and Latter.
- Though Amy said that she would join me later, I never saw her again.
- "There are two kinds of worries: those you can do something about and those you can't. Don't spend any time on the latter." (Duke Ellington)
(a) "Were it left to me to decide whether we should have a government without newspapers, or newspapers without a government, I should not hesitate a moment to prefer the ______." (Thomas Jefferson)
(b) Merdine told Gus a joke, and two minutes ______ he began laughing.