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

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adj. closest to, superlative form of near: most near.

preposition. closest to

ad. (superlative of `near' or `close') within the shortest distance

"A vote was passed in town meeting that the new Church should be located "on the nearest convenientest spot to the centre," but the words _nearest, convenientest_, were a cause of furious contention."

extreme   

next    proximal    proximate    hithermost   

dearest    severest