Definitions from Wiktionary ( )

▸ noun:  (dominoes) A tile divided into two squares, each having 0 to 6 (or sometimes more) dots or pips (as in dice), used in the game of dominoes.
▸ noun:  (politics) A country that is expected to react to events in a neighboring country, according to the domino effect.
▸ noun:  A masquerade costume consisting of a hooded robe and a mask covering the upper part of the face.
▸ noun:  The mask itself.
▸ noun:  The person wearing the costume.
▸ noun:  (geometry) A polyomino made up of two squares.
▸ noun:  (music, colloquial) A mistake in performing.
▸ verb:  (intransitive) To collapse in the manner of dominoes.
▸ verb:  (transitive) To cause to collapse in the manner of dominoes.

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