What does "longtime" mean?

Having endured for a long period of time.

What is a synonym for "longtime"?

Common synonyms include: age-old, enduring, historic, long-time, longstanding.

adj, adv

adj, adv ·2 syllables ·Rare ·Advanced level

Adjective

1
Having endured for a long period of time.
"My longtime friend, since birth actually, called and gently broke the bad news to me."

Adjective

1
having existed or persisted or continued in a particular role or state for a long time wordnet

Adverb

"He is the governor's longtime companion."

From long + time.