-
At what time: When will we leave?
(adverb)
-
At the time that: in the spring, when the snow melts.
(conjunction)
-
As soon as: I'll call you when I get there.
(conjunction)
-
Whenever: When the wind blows, all the doors rattle.
(conjunction)
-
During the time at which; while: when I was young, I was sick all the time.
(conjunction)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.