a man’s tall, collapsible top hat, held open or in shape by springs and usually covered with a black, silky fabric.
Also called gibus.
Compare 1 (def 4), , .
a collapsible top hat operated by a spring Also called gibus
noun 1. a theater devoted chiefly to operas. 2. Older Use. a theater, especially a large, ornate one. noun 1. a theatre designed for opera
[op-uh-rand] /ˈɒp əˌrænd/ noun, Mathematics. 1. a quantity upon which a mathematical operation is performed. /ˈɒpəˌrænd/ noun 1. a quantity or function upon which a mathematical or logical operation is performed n. 1886, from Latin operandum, neuter gerundive of operari (see operation). programming An argument of an operator or of a machine language instruction. (1995-08-18)
[op-er-uh nt] /ˈɒp ər ənt/ adjective 1. ; producing effects. noun 2. a person or thing that . /ˈɒpərənt/ adjective 1. producing effects; operating noun 2. a person or thing that operates 3. (psychol) any response by an organism that is not directly caused by a stimulus adj. “that works,” early 15c., from Latin operantem […]
noun 1. (def 1). operant conditioning n. A process of behavior modification in which a subject is encouraged to behave in a desired manner through positive or negative reinforcement, so that the subject comes to associate the pleasure or displeasure of the reinforcement with the behavior.