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There are 4 twelve-letter words beginning with OPERA

OPERATICALLY• operatically adv. In an operatic manner.
• OPERATIC adv. relating to opera.
OPERATIONISM• operationism n. (Philosophy) The doctrine that the meaning of a term consists of the operation(s) performed in defining it.
• OPERATIONISM n. the theory that defines scientific concepts by means of the operations used to prove or determine them, also OPERATIONALISM.
OPERATIONIST• operationist n. A proponent of operationism.
• OPERATIONIST n. an adherent of operationism.
OPERATORLESS• operatorless adj. Without an operator (person who operates); fully automatic.
• OPERATORLESS adj. without an operator.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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