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Valid in Scrabble US · 15 points
8 synonyms in 3 meanings · 5 playable in Scrabble US
an unknown and unexplored region
Also: unknown region, terra incognita.
anyone who does not belong in the environment in which they are found
a variable whose values are solutions of an equation
Also: unknown quantity.
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Dictionary: official Scrabble dictionary (US), UK Scrabble Dictionary, Words with Friends ENABLE