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Pronunciation varies by accent · numeral
The cardinal number immediately following sixty-five and preceding sixty-seven..
Use sixty-six when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Sixty-six means The cardinal number immediately following sixty-five and preceding sixty-seven..
Common synonyms include 66, LXVI.
The opposite depends on the specific sense.
Use sixty-six where its definition matches the intended context.
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