at a moment's/minute's notice

: a minute portion or point of time : instant

: a comparatively brief period of time

: present time

: the 60th part of an hour of time : 60 seconds

: the 60th part of a degree of angular measure

: the distance one can traverse in a minute

: to make notes or a brief summary of

: very small : infinitesimal

: of small importance : trifling

: marked by close attention to details

: warning or intimation of something : announcement

: the announcement of a party's intention to quit an agreement or relation at a specified time

: the condition of being warned or notified

: to give notice of

: to comment upon

: review