Boolean
Concise Oxford English Dictionary © 2008 Oxford University Press:
Boolean /ˈbuːlɪən/
▶adjective denoting a system of algebraic notation used to represent logical propositions by means of the binary digits 0 (false) and 1 (true), especially in computing and electronics. ▶noun Computing a binary variable with these possible values.
'Boolean' also found in these Oxford entries:

