Definition

Noun: A unit of weight within the avoirdupois system, the common system of weights used in English-speaking countries for measuring goods other than precious metals, gems, and drugs. It is based on the pound, which is divided into 16 ounces.

Usage

The term "avoirdupois unit" refers specifically to any single weight measurement within this system. It is used in contexts involving commerce, shipping, cooking (in some countries), and everyday measurements of mass.

Examples

• The package's weight was listed in avoirdupois units, specifically pounds and ounces.
• Converting from metric grams to an avoirdupois unit like ounces requires a precise calculation.
• In the US, people commonly use avoirdupois units such as the pound to describe their body weight.

Advanced Usage

• Historical Context: The avoirdupois system originated in England and was later standardized. The term "avoirdupois" itself comes from Old French (goods of weight).
• Technical Distinction: An "avoirdupois unit" is explicitly contrasted with units from the troy system (used for precious metals) and the apothecaries' system (historically used in pharmacy).

Variants and Related Words

• Avoirdupois weight: Often used synonymously with "avoirdupois unit," though it can also refer to the system as a whole.
• Avoirdupois pound: The fundamental unit of the system, equal to 16 avoirdupois ounces or 7,000 grains.
• Avoirdupois ounce: A unit equal to 1/16 of an avoirdupois pound.

Synonyms

• Imperial weight unit (in contexts referring to the British Imperial System, which uses avoirdupois).
• Customary unit (in the context of the United States customary units, which are based on avoirdupois).

Related Phrases

• "In avoirdupois": A phrase indicating that a given weight is measured in the avoirdupois system.
  • The recipe called for a pound of flour, in avoirdupois.
• "Avoirdupois measure": Another term for the system or its units collectively.

Noun

1. any of the units of the avoirdupois system of weights