A domino or die whose upward face shows one pip(noun)
WordNet. Princeton University. 2010.
Use "one-spot" in a sentence
"Indonesia is determinedly if sometimes inconsistently pushing forward with the fight against business-stifling corruption with a slightly higher score and a one-spot improvement in its ranking, to 115."
"There are tiny one-spot paintings, paintings with spots at their corners, ones covered with rank after rank of hundreds, if not thousands, of little circles."
"Also, Wesley, or even Mashburn, can play the one-spot in this set to take advantage of the matchups."