1.AdverbFor all time, for all eternity; for a lifetime; for an infinite amount of time.
"I shall love you forever."
2.AdverbFor a very long time, a seeming eternity.
"We had to wait forever to get inside.; That was forever ago."
3.AdverbConstantly or frequently.
"You are forever nagging me."
4.NounAn extremely long time.
"I haven't seen him in forever!; It took me forever to make up my mind.; Don't spend forever on the phone!; She should've been here five forevers ago!"
5.NounA mythical time in the future that will never come.
"Sure, I'd be happy to meet with you on the 12th of forever."