interior decoration

WordReference Random House Learner's Dictionary of American English © 2026

inˈte•ri•or dec•oˈra•tion, n. [uncountable]

1. Architecture the planning of the color schemes and other decorative parts of the insides of a house, etc.

in•te•ri•or dec•o•ra•tor, n. [countable]

WordReference Random House Unabridged Dictionary of American English © 2026

inte′rior decora′tion, 

1. Architecture See interior design. 
2. Architecture materials used to decorate an interior.
• 1800–10

Collins Concise English Dictionary © HarperCollins Publishers::

interior decoration noun

1. the colours, furniture, etc, of the interior of a house, etc
2. Also called: interior design the art or business of an interior decorator