Meaning of “mark” - Learner’s Dictionary

mark

verb uk us /mɑːk/
HAPPEN [ T ]

If an event marks the beginning, end, etc of something, it causes it, or happens at the same time as it:

His death marks the end of an era in television.
CELEBRATE [ T ]

If you mark an occasion, you do something to celebrate it:

They've declared Tuesday a national holiday to mark the 10th anniversary of Independence.
SHOW A PLACE [ T ]

B2 to show where something is by drawing or putting something somewhere:

I've marked my street on the map for you.
GIVE RESULTS [ I, T ]

B2 to check a piece of work or an exam, showing mistakes and giving a letter or number to say how good it is:

to mark essays
DIRTY [ T ]

to leave an area of dirt on something

(Definition of “mark verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)