com ‧ mem ‧ o ‧ rate /kəˈmeməreɪt/ BrE AmE verb [transitive]
[ Date: 1600-1700 ; Language: Latin ; Origin: past participle of commemorare , from com- ( ⇨ COM- ) + memorare 'to remind of' ]
to do something to show that you remember and respect someone important or an important event in the past:
a parade to commemorate the town’s bicentenary
—commemorative /kəˈmem ə rətɪv/ adjective :
a commemorative plaque