nondimensional

adjective

non·​di·​men·​sion·​al ˌnän-də-ˈmench-nəl 

-ˈmen(t)-shə-nᵊl,

 also  -dī-

: not expressed in or representing terms of any particular unit (as of mass, length, or time)

nondimensional numbers

a nondimensional width to height ratio

Word History

First Known Use

1904, in the meaning defined above