Definition of "operandum" [operandum]

• A lever, key or device installed in a operant chamber, upon which the "subject" exerts its responses. Sometimes referred to as a manipulandum. In the prototypical operant conditioning experiment, a rat (the subject) presses upon a lever (the operandum) which triggers the delivery of food (the reward or reinforcer). (noun)

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• "She created a body of work that has lasted, not as fiction, but as a real modus operandum."
• "I decided that that was not going to be a place that I was going to go to, which is generally my modus operandum (sic) is to bury any kind of feeling I have in my music and I just kept journals and journals and journals and wrote a lot and as I'm getting that through -- a lot of lyrics in there."
• "* Nemo quisquam hominum sive ad cogitandum, sive ad operandum quodcunque bonum potest esse idoneus; nisi qui fuerit munere gratuito divinae opitulationis adjutus; ab ipso namque est initium bonae voluntatis, ab ipso facultas boni operis, ab ipso perseveantia bonae conversationis."