Meaning of “true” - Learner’s Dictionary

true

adjective us uk /truː/
That's not necessarily true.Her story could, conceivably, be true.I certify that the information I have given is true.They're filming a television drama that was inspired by a true story.What he says is true up to a point.
NOT FALSE

A2 based on facts and not imagined:

a true story
[ + (that) ] Is it true that Martin and Sue are getting married?
→ Opposite untrue
REAL [ always before noun ]

B1 real:

a true friend
true love
come true

B1 If a dream or hope comes true, it really happens:

I always dreamt of winning money but I never thought it would come true.
be true to sb/sth

to be loyal and sincere even in a difficult situation:

It's important to be true to your principles.

See also

(Definition of “true” from the Cambridge Learner’s Dictionary © Cambridge University Press)