Definition of "orientable" [orientable]

• Able to be oriented. (adjective)

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• "These are the finest closed, non-orientable, boundary-free manifolds sold anywhere in our three spatial dimensions."
• "There's a theorem in knot theory that given any 'tame' knot, there is an orientable surface whose boundary is this knot."
• "It has the mathematical property of being non-orientable."