o ‧ va ‧ tion /əʊˈveɪʃ ə n $ oʊ-/ BrE AmE noun [countable] formal
[ Date: 1500-1600 ; Language: Latin ; Origin: ovatio , from ovare 'to show great happiness' ]
if a group of people give someone an ovation, they ↑ clap to show approval:
The Chancellor’s entrance was greeted with a standing ovation (=everyone stood up) .
Fans gave the rock group a thunderous ovation.