01 n. The time between; the time between sunrise and noon; specifically, the third hour of the day, or nine o'clock in the morning, according to …
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The time between; the time between sunrise and noon; specifically, the third hour of the day, or nine o'clock in the morning, according to ancient reckoning; hence, mealtime, because formerly the principal meal was eaten at that hour; also, later, the afternoon; the time between dinner and supper.[Obs. or Prov. Eng.]“Betwixt undern and noon was the field all won.” — R. of Brunne.“In a bed of worts still he lay Till it was past undern of the day.” — Chaucer.