longtime
UK: ˈlɒŋtaɪm | US: ˈlɔːŋtaɪm
adj. existing or lasting for a long period of time
n. a long period of time
The word "longtime" is a straightforward compound formed by combining "long" (from Old English lang, meaning "having great linear extent or duration") and "time" (from Old English tīma, meaning "a measurable period"). The fusion reflects a literal meaning of "a long duration" and has been used since Middle English to describe enduring relationships, habits, or states. Its simplicity preserves the original meanings of both morphemes without semantic shift.
She is a longtime supporter of environmental causes.
After longtime consideration, he finally made his decision.
The two companies have a longtime partnership.
His longtime friend visited him last weekend.
The restaurant is a longtime favorite among locals.