Full Idea
Counting is the activity of putting an initial segment of a serially ordered string in 1-1 correspondence with some other collection of entities.
Gist of Idea
Counting puts an initial segment of a serial ordering 1-1 with some other entities
Source
Jeffrey H. Sicha (Counting and the Natural Numbers [1968], 2)
Book Reference
-: 'Philosophy of Science' [-], p.407