Best-friend definition

An especially close and trusted friend.
noun
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The definition of a best friend is a person who you value above other friends in your life, someone you have fun with, someone you trust and someone in whom you confide.

The first person you call when you get good news or want to go out for a bite to eat is an example of your best friend.

noun
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Other Word Forms

Noun

Singular:
best-friend
Plural:
best-friends