I. | ̷ ̷ ̷ ̷ ̷ ̷| ̷ ̷ adjective
: being one more than 77 in number
seventy-eight years
— see number table
II. pronoun, plural in construction
: 78 countable persons or things not specified but under consideration and being enumerated
seventy-eight are here
seventy-eight were found
III. noun
1. : eight and 70 : three times 26 : six times 13
2.
a. : 78 units or objects
a total of seventy-eight
b. : a group or set of 78
3. : the numerable quantity symbolized by the arabic numerals 78
4. : the 78th in a set or series
5. : a phonograph record designed to be played at 78 revolutions per minute — usually written 78