To complete such an exercise; to carry out such a technique by filling in each space with the appropriate color.

alternative form of color by number / (rare) plural of color by number

alternative form of color by number

A memorable mobile phone number.

(chemistry, physics) The number of atoms present in 12 grams of isotopically pure carbon-12, being 6.02214076 × 10²³. By definition, the number of elementary entities (atoms or molecules) comprising one mole of a given substance.

(informal) To damage; to treat harshly; to produce ill effects in.

(physics) A dimensionless parameter that determines the behavior of viscous flow patterns. In pipe flow a value less than about 2,000 (known as the critical Reynolds number) produces laminar flow, one above about 3,000 produces turbulent flow (intermediate values produce unpredictable behavior).

The number (street address) assigned to a particular house to distinguish it from other buildings on the same street.

(Canada, US) A toll-free telephone number.

(photography) The ratio of the focal length of a lens to its diameter; a measure of the light-gathering ability of the lens.