Learn how to say Commemoratory correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word commemorate:
recall and show respect for (someone or something):
a wreath-laying ceremony to commemorate the war dead
a stone commemorating a boy who died at sea
mark or celebrate (an event or person) by doing or producing something:
the victory was commemorated in songs
late 16th century: from Latin commemorat- ‘brought to remembrance’, from the verb commemorare, from com- ‘altogether’ + memorare ‘relate’ (from memor ‘mindful’)