call and response
(singing) A musical technique in which one or more performers calls and others (often the audience) respond with alternating musical phrases.
Rare spelling of time ball.
(chemistry) Any of a class of organic compound formed by addition of an oxygen atom to an amine - R₃N⁺-O⁻, but sometimes written R₃N=O.
The study of snow and ice. / The science of refrigeration.
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