s, 0, 1, 4, 9 are letters that make '1940s'
19, 40, 94 are words within '1940s'
1 possible definitions for '1940s'
Under this definition, 1940s is a noun and has the following properties:
forties has the same meaning as 1940s
'1940s' can be a type of decade, decennary, decennium.