еднодневка

Etymology
From.

Noun

 * 1)  something that expires in a day
 * → short-term decision, agreement
 * → one-hit wonder (e.g. )
 * 1)  daypack small tourist bagpack enough to bring supplies for one day
 * 2) mayfly, dayfly, ephemerid primitive winged insect of order, with short adult life (from a few hours to 10-15 days)