In the English-speaking world, a unit of liquid capacity, one-third of a pipe = 42 wine gallons (hence the name “tierce,” meaning third). See wine barrel for a chart tracing its changes in size and its relation to other wine measures.

In the United States the tierce was used for lard, and became the barrel of petroleum.


Sometimes spelled “terce.” Among the medieval Christians of Europe, the period of the day from sunrise to midmorning. The other divisions of the day were sext, none, and vespers.

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