Definitions from Wiktionary ( )

▸ noun:  (uncommon or dated) The spirit; the human soul.
▸ noun:  The disembodied soul; the soul or spirit of a deceased person; a spirit appearing after death.
▸ noun:  Any faint shadowy semblance; an unsubstantial image.
▸ noun:  A false image formed in a telescope, camera, or other optical device by reflection from the surfaces of one or more lenses.
▸ noun:  An unwanted image similar to and overlapping or adjacent to the main one on a television screen, caused by the transmitted image being received both directly and via reflection.
▸ noun:  A ghostwriter.
▸ noun:  A nonexistent person invented to obtain some (typically fraudulent) benefit.
▸ noun:  A dead person whose identity is stolen by another. See ghosting.
▸ noun:  (Internet) An unresponsive user on IRC, resulting from the user's client disconnecting without notifying the server.
▸ noun:  (computing) An image of a file or hard disk.
▸ noun:  (theater) An understudy.
▸ noun:  (espionage) A covert (and deniable) agent.
▸ noun:  The faint image that remains after an attempt to remove graffiti.
▸ noun:  (video games) An opponent in a racing game that follows a previously recorded route, allowing players to compete against previous best times.
▸ noun:  Someone whose identity cannot be established because there are no records of him/her.
▸ noun:  (quantum mechanics) An unphysical state in a gauge theory.
▸ noun:  (attributive, linguistics, computing) A formerly nonexistent character that was at some point mistakenly encoded into a character set standard, which might have since become used opportunistically for some genuine purpose.
▸ noun:  (uncountable) A game in which players take turns to add a letter to a possible word, trying not to complete a word.
▸ noun:  (attributive, in names of species) White or pale.
▸ noun:  (attributive, in names of species) Transparent or translucent.
▸ noun:  (attributive) Abandoned.
▸ noun:  (attributive) Remnant; the remains of a(n).
▸ noun:  (attributive) Perceived or listed but not real.
▸ noun:  (attributive) Of cryptid, supernatural or extraterrestrial nature.
▸ noun:  (attributive) Substitute.
▸ verb:  (obsolete, transitive) To haunt; to appear to in the form of an apparition.
▸ verb:  (obsolete) To die; to expire.
▸ verb:  (literary) To imbue with a ghost-like hue or effect.
▸ verb:  (transitive, intransitive) To ghostwrite.
▸ verb:  (nautical) To sail seemingly without wind.
▸ verb:  (computing) To copy a file or hard drive image.
▸ verb:  (graphical user interface) To gray out (a visual item) to indicate that it is unavailable.
▸ verb:  (Internet, transitive) To forcibly disconnect an IRC user who is using one's reserved nickname.
▸ verb:  (intransitive) To appear or move without warning, quickly and quietly; to slip.
▸ verb:  (transitive) To transfer (a prisoner) to another prison without the prior knowledge of other inmates.
▸ verb:  (slang) To kill.
▸ verb:  (slang, social media) To perform an act of ghosting: to break up with someone without warning or explanation; to ignore someone, especially on social media.
▸ verb:  (film) To provide the speaking or singing voice for another actor, who is lip-syncing.
▸ noun:  (countable) Clipping of ghost pepper. [Synonym of bhut jolokia]

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