Definition of mark:
(n) :
a
border or
frontier; a
common, or area of common land, especially among early Germanic peoples
"1786, To give them an accurate eye and strength of arm, none under twenty-four years of age might shoot at any standing mark, except it was for a rover, and then he was to change his mark at every shot"
(v) :
to indicate in some way for later reference; to take note of