(1):

(a.) Ten times ten; five score; as, a hundred dollars.

(2):

(n.) The product of ten mulitplied by ten, or the number of ten times ten; a collection or sum, consisting of ten times ten units or objects; five score. Also, a symbol representing one hundred units, as 100 or C.

(3):

(n.) A division of a country in England, supposed to have originally contained a hundred families, or freemen.