I. | ̷ ̷ ̷ ̷| ̷ ̷ adjective
: being one more than 52 in number
fifty-three years
— see number table
II. pronoun, plural in construction
: 53 countable persons or things not specified but under consideration and being enumerated
fifty-three are here
fifty-three were found
III. noun
1. : three and 50
2.
a. : 53 units or objects
a total of fifty-three
b. : a group or set of 53
3. : the numerable quantity symbolized by the arabic numerals 53
4. : the 53d in a set or series