Without number; having too many to count.

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

(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.

(usually used attributively) A simple drawing exercise, intended especially for children, consisting of a line drawing that divides the artwork into distinct spaces, the intended color of each indicated by a number and referenced from a key.

alternative form of color by number

A memorable mobile phone number.

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

(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.