Longtime describes something that has lasted for many years, such as a longtime friend or a longtime habit. It emphasizes the length of time involved.
It is a compound of “long” and “time,” used together in English since at least the 19th century. The form became fixed as a single adjective over time.
Calling someone a “longtime friend” quietly packs in a whole history of shared events, changes, and survival through conflicts. The word reminds us that time itself can be a powerful glue in relationships.
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