Alternative spelling of number two / Short form of number 2 pencil

Alternative spelling of wavenumber

A list whose items are numbered, with various styles including Arabic numerals and Roman numerals.

The state of being without number, uncountability.

(grammar) A word that expresses a countable number of times; an adverbial numeral.

(grammar) A word that answers "how many times each?" or "how many at a time?"

plural of number sign

plural of octane number

plural of vanity number

An octane number, used by the American Society for Testing and Materials to estimate the antiknock characteristics of a fuel at low engine speeds