Meaning of “average” - Learner’s Dictionary

average

adjective uk us /ˈævərɪdʒ/
USUAL

B2 usual and like the most common type:

an average person
an average day
AMOUNT [ always before noun ]

B1 An average amount is calculated by adding some amounts together and then dividing by the number of amounts:

an average age/temperature
NOT EXCELLENT

not excellent, although not bad:

The food was pretty average.

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