Meaning of “familiarity” - Learner’s Dictionary

familiarity

noun [ U ] uk us /fəˌmɪliˈærəti/
KNOWLEDGE

a good knowledge of something, or experience of doing or using it:

Her familiarity with computers is very impressive.
FRIENDLY BEHAVIOUR

friendly and informal behaviour:

the growing familiarity between William and Jane

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