window

win·dow

noun \ˈwin-(ˌ)dō, -də(-w)\

Definition of WINDOW

1

: fenestra 1

2

: a small surgically created opening : fenestra 2a

3

: a usually narrow interval of time or range of values for which a certain condition or an opportunity exists <coma and multiorgan failure can occur within hours and there may be a very narrow window of opportunity for transplantation—J. P. A. Lodge>—see therapeutic window