basis

1 ENTRIES FOUND:
basis /ˈbeɪsəs/ noun
plural bases /ˈbeɪˌsiːz/
basis
/ˈbeɪsəs/
noun
plural bases /ˈbeɪˌsiːz/
Britannica Dictionary definition of BASIS
1 
: something (such as an idea or set of ideas) from which another thing develops or can develop
[count]
— usually singular
[noncount]
2 
[noncount] : a reason for doing something
3 
[singular]
a  : a fixed pattern or system for doing something — used with on
b  — used to describe the way people act with each other
— see also on a first-name basis at first name