1

Words created by adding a letter to the beginning or end of 1

M1 is a word created by adding a letter to '1'

2 possible definitions for '1'

Under this definition, 1 is a noun and has the following properties:

one, ace, unity, I, single have the same meaning as '1'

'1' can be a type of digit, figure.

monad, monas, singleton are types of '1'.

Under this definition, 1 is an adjective and has the following properties:

one, ane, i have the same meaning as '1'

cardinal is similar to 1.