Definitions from Wiktionary (opaque)

▸ adjective:  Neither reflecting nor emitting light.
▸ adjective:  Allowing little light to pass through, not translucent or transparent.
▸ adjective:  (figuratively) Unclear, unintelligible, hard to get or explain the meaning of.
▸ adjective:  (figuratively) Obtuse, stupid.
▸ adjective:  (computing) Describes a type for which higher-level callers have no knowledge of data values or their representations; all operations are carried out by the type's defined abstract operators.
▸ noun:  (obsolete, poetic) An area of darkness; a place or region with no light.
▸ noun:  Something which is opaque rather than translucent.
▸ verb:  (transitive) To make, render (more) opaque.

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