Answer:

trimester

Answer	Crossword Clue
TRIMESTER	Obstetrical period
TRIMESTER	School term
TRIMESTER	About ninety days

TRIMESTER	Pregnancy division
TRIMESTER	Gestation period
TRIMESTER	Academic term
TRIMESTER	Three-month term
TRIMESTER	Academic division
TRIMESTER	Mix-up: remit rest in a few months (9)
TRIMESTER	Something that goes for a quarter?
TRIMESTER	Part of an academic year

TRIMESTER	The third one may end in a hospital visit
TRIMESTER	Period of development
TRIMESTER	College division