con ‧ viv ‧ i ‧ al /kənˈvɪviəl/ BrE AmE adjective formal
[ Date: 1600-1700 ; Language: Late Latin ; Origin: convivialis , from Latin convivium 'grand meal' , from com- ( ⇨ COM- ) + vivere 'to live' ]
friendly and pleasantly cheerful:
a convivial atmosphere
—convivially adverb
—conviviality /kənˌvɪviˈæləti, kənˌvɪviˈælɪti/ noun [uncountable]