the.com/trimester

three acts of one body building another from scratch, no intermission

means A period of three months, especially one of the three divisions of a pregnancy or an academic year.

from From Latin trimestris, 'of three months,' built from tri- 'three' and mensis 'month' — the same mensis that lurks in 'menstrual' and is a cousin of the Moon-words across Indo-European languages, since early calendars counted time by lunar cycles. It entered English by way of French trimestre, first describing spans of the year before doctors borrowed it to carve up pregnancy.

first act
all major organs form before most bumps show
second act
baby can hear voices and develops fingerprints
third act
brain triples in size before birth
latin root
means a period of three months
not just pregnancy
colleges borrowed the word for school terms
for instance

first trimester — pregnancy weeks 1-13, when morning sickness and organ development occur

second trimester — pregnancy weeks 14-27, when fetal movement becomes visible

third trimester — pregnancy weeks 28-40, when the fetus gains most weight and labor approaches

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