figment of (one's)/the imagination

An experience that initially is thought to be real but is actually imagined. I thought I heard the sound of my front door opening last night but it turned out to be a figment of my imagination.

Common Names:

Name	Pronounced	Usage
Louis	['lu:is]
ÈRic	-	Catalan
Pelagia	pe-LAHG-yah (Polish)	Ancient Greek, Greek, Polish
Nichols	['nikəlz]
Saira	-	Urdu
Flavia	FLAH-vyah (Italian, Spanish)	Italian, Spanish, Romanian, Ancient Roman