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| a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question. |
| a gadget; dingus; thingumbob. |
| instrumental conditioning | |
noun | |
| operant conditioning that pairs a response with a reinforcement in discrete trials; reinforcement occurs only after the response is given |