For everlasting time; eternally: No one can live forever.
At all times; incessantly: was forever complaining about the job.
A seemingly very long time: It has taken forever to resolve these problems.
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.