the.com/period

a full stop so confident it ended civilizations, sentences, and group chats.

means A period is the dot that ends a sentence, or a stretch of time with a beginning and an end (also, the menstrual cycle's monthly arrival).

from From Greek 'periodos,' literally 'a way around' — 'peri-' (around) plus 'hodos' (path or road), the same 'hodos' lurking in 'method' and 'exodus.' It first meant a complete cycle or circuit of time, then narrowed to the punctuation mark that completes the circuit of a sentence. It traveled through Latin 'periodus' and French into English, and the menstrual sense grew from the older 'recurring interval' meaning.

ancient origin
Greeks used dots to mark pauses in speech
texting menace
a period now reads as passive-aggressive anger
geologic scale
Earth's history splits into vast named periods
physics term
the time one full cycle takes to repeat
slang weapon
saying period ends an argument cold
for instance

menstrual cycle — occurs approximately every 28 days in people with ovaries during reproductive years

permian-triassic extinction — 252 million years ago, killed 96% of marine species and 70% of vertebrate species

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