Definitions from Wiktionary ( )

▸ noun:  A cover, or partial cover, for the face, used for disguise or protection.
▸ noun:  That which disguises; a pretext or subterfuge.
▸ noun:  (poetic) Appearance, likeness.
▸ noun:  A festive entertainment of dancing or other diversions, where all wear masks; a masquerade.
▸ noun:  A person wearing a mask.
▸ noun:  (obsolete) A dramatic performance in which the actors wore masks and represented mythical or allegorical characters.
▸ noun:  (architecture) A grotesque head or face, used to adorn keystones and other prominent parts, to spout water in fountains, and the like.
▸ noun:  (fortification) In a permanent fortification, a redoubt which protects the caponiere.
▸ noun:  (fortification) A screen for a battery.
▸ noun:  (zoology) The lower lip of the larva of a dragonfly, modified so as to form a prehensile organ.
▸ noun:  (publishing, film) A flat covering used to block off an unwanted portion of a scene or image.
▸ noun:  (computing, programming) A pattern of bits used in bitwise operations; bitmask.
▸ noun:  (computer graphics) A two-color (black and white) bitmap generated from an image, used to create transparency in the image.
▸ noun:  (heraldry) The head of a fox, shown face-on and cut off immediately behind the ears.
▸ noun:  (psychology) A social phenomenon where autistic people learn, practice, and perform certain behaviors and suppress others in order to appear more neurotypical.
▸ verb:  (transitive) To cover (the face or something else), in order to conceal the identity or protect against injury; to cover with a mask or visor.
▸ verb:  (transitive) To disguise as something else.
▸ verb:  (transitive) To conceal from view or knowledge; to cover; to hide.
▸ verb:  (transitive, military) To conceal; also, to intervene in the line of.
▸ verb:  (transitive, military) To cover or keep in check.
▸ verb:  (intransitive) To take part as a masker in a masquerade.
▸ verb:  (intransitive) To wear a mask.
▸ verb:  (intransitive, obsolete) To disguise oneself, to be disguised in any way.
▸ verb:  (intransitive) To conceal or disguise one's autism.
▸ verb:  (transitive) to cover or shield a part of a design or picture in order to prevent reproduction or to safeguard the surface from the colors used when working with an air brush or painting
▸ verb:  (transitive, computing) To set or unset (certain bits, or binary digits, within a value) by means of a bitmask.
▸ verb:  (transitive, computing) To disable (an interrupt, etc.) by setting or unsetting the associated bit.
▸ noun:  mesh
▸ noun:  (UK dialectal, Scotland) The mesh of a net; a net; net-bag.
▸ noun:  (UK dialectal) Mash.
▸ verb:  (transitive, UK dialectal) To mash.
▸ verb:  (transitive, UK dialectal) (brewing) To mix malt with hot water to yield wort.
▸ verb:  (transitive, Scotland dialectal) To be infused or steeped.
▸ verb:  (UK dialectal, Scotland) To prepare tea in a teapot; alternative to brew.
▸ verb:  (transitive, UK dialectal) To bewilder; confuse.

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