Definitions for undern
The third ecclesiastical hour of the day, at around nine o'clock in the morning; tierce.
The sixth hour of the day; midday.
The late afternoon; the evening.
Origin: undern. Cognate with dialectal Dutch onder, dialectal German Untern, dialectal Swedish undarn.
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