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There are 4 fourteen-letter words beginning with OPT

OPTIMALISATION	• optimalisation n. Alternative form of optimalization. • OPTIMALISATION n. the process of optimalising, also OPTIMALIZATION.
OPTIMALIZATION	• optimalization n. Alternative form of optimization. • OPTIMALIZATION n. the process of optimalizing, also OPTIMALISATION.
OPTIMISTICALLY	• optimistically adv. In an optimistic manner. • OPTIMISTICAL adv. optimistic, also OPTIMISTIC.
OPTOELECTRONIC	• optoelectronic adj. Of or pertaining to optoelectronics. • optoelectronic adj. That has both optical and electronic components, especially such components that interact. • OPTOELECTRONIC adj. relating to optoelectronics.

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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See this list for:

English Wiktionary: 20 words
Scrabble in French: 11 words
Scrabble in Spanish: 2 words
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: 10 words

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