Middle English Dictionary Entry

tē̆rce n.
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Entry Info

Definitions (Senses and Subsenses)

Astron. and geom. A sixtieth part of a second of an arc, one thirty-six hundredth of a minute of an arc.
Eccl. (a) The third canonical hour of the day, 9 a.m.; houre of ~; heigh ~, the first part of the period from 9 a.m. to noon; (b) the office said at the hour of terce.