This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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verb-intransitive. To make a choice or decision: opted for early retirement; opted not to go.

phrasal-verb. opt out Slang To choose not to participate in something: "give individual schools the right to opt out of the local educational authority” ( Newsweek).

v. To choose; to select.

n. In grammar, an abbreviation of optative.

To choose one of two alternatives; choose.

An abbreviation of optical;

of optician;

of optics.

v. select as an alternative over another

"Lofgren called this "a counterintuitive and misleading definition of the term 'opt out.'""

opted    opting    opts   

optional    option   

cop out    opt out   

opt in    co-opt    opt out   

adopt    chopped    co-opt    copped    cropped    dropped    flopped    hopped    lopped    mopped