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octave

1

A unit of frequency interval, a ratio of 2:1. It is equal to 301 savarts or 1200 cents.

2

A unit of capacity = ½ quarter = ¼ hogshead = ⅛ butt, pipe or puncheon. In England in the 20ᵗʰ century, an octave of whisky was 14 imperial gallons (about 64 liters) and an octave of sherry was 13¾ imperial gallons (about 62½ liters, an eighth of a butt or bota).

examples

Tylman Barkys, H[anse], 1 hhd. with 82½ timbers grey, 9 firkins 16 octaves dole eels, £34 6s. 8d.

H. S. Cobb, editor.
The Overseas Trade of London. Exchequer Customs Accounts 1480-1.
London Record Society, 1990.
Entry 204, page 72.