instant
in-stant
noun
A very short period of time; a precise moment.
"I'll be with you in an instant."
adjective
Happening or produced immediately; ready for immediate use.
"She wanted instant results from the new plan."
Thesaurus
Synonyms: inst, present, exigent, crying, clamant, insistent, imperative, blink of an eye, heartbeat, wink, split second, jiffy