1. (

• acquaintance ,
• familiarity ,
• conversance ,
• conversancy

) personal knowledge or information about someone or something ;

2. (

• familiarity ,

) usualness by virtue of being familiar or well known ;

3. (

• familiarity ,
• intimacy ,
• closeness ,

) close or warm friendship; "the absence of fences created a mysterious intimacy in which no one knew privacy" ;

4. (

• casualness ,
• familiarity ,

) a casual manner ;

5. (

• familiarity ,
• impropriety ,
• indecorum ,
• liberty

) an act of undue intimacy ;