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There are 15 ten-letter words beginning with OPT

OPTATIVELYoptatively adv. In an optative way.
OPTATIVE adv. expressing a wish.
OPTIMALISEoptimalise v. Alternative form of optimalize.
OPTIMALISE v. to bring to the most desirable or most efficient state, also OPTIMALIZE.
OPTIMALITYoptimality n. The property of being optimal.
OPTIMALITY n. the state of being optimal.
OPTIMALIZEoptimalize v. Alternative form of optimize.
OPTIMALIZE v. to bring to the most desirable or most efficient state, also OPTIMALISE.
OPTIMISERSoptimisers n. Plural of optimiser, an alternative spelling of optimizer.
OPTIMISER n. one who optimises, also OPTIMIZER.
OPTIMISINGoptimising v. Present participle of optimise.
OPTIMISE v. to make as effective as possible, also OPTIMIZE.
OPTIMISTICoptimistic adj. Expecting the best in all possible ways.
optimistic adj. (Computing) Allowing other processes to perform transactions on the same data at the same time, and…
OPTIMISTIC adj. having optimism, also OPTIMISTICAL.
OPTIMIZERSoptimizers n. Plural of optimizer.
OPTIMIZER n. one who optimises, also OPTIMISER.
OPTIMIZINGoptimizing v. Present participle of optimize.
optimizing adj. Carrying out optimization.
OPTIMIZE v. to make as effective as possible, also OPTIMISE.
OPTIONALLYoptionally adv. In an optional manner. Not mandatorily.
OPTIONAL adv. not compulsory.
OPTOLOGIESOPTOLOGY n. the study of sight.
OPTOLOGISToptologist n. One who studies optology.
OPTOLOGIST n. an optician.
OPTOMETERSoptometers n. Plural of optometer.
OPTOMETER n. an instrument for testing vision.
OPTOMETRICoptometric adj. Of or pertaining to optometry.
OPTOMETRIC adj. relating to optometry, also OPTOMETRICAL.
OPTOPHONESoptophones n. Plural of optophone.
OPTOPHONE n. a device transforming light into sound.

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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