Hungarian word egyszerre comes from Hungarian egyszer, Hungarian -re-

Detailed word origin of egyszerre

Dictionary entry	Language	Definition
egyszer	Hungarian (hun)	(colloquial) simply (used when something is obvious to the speaker, usually in possibly unfinished conditional sentences with the word ha - "if"). Once (one time). One day, once (some time in the past or the future).
-re-	Hungarian (hun)
egyszerre	Hungarian (hun)	Simultaneously, at the same time.

Words with the same origin as egyszerre