What is the meaning of Ghost?

A disembodied soul; a soul or spirit of a deceased person; a spirit appearing after death.

A spirit; a human soul.

Any faint shadowy semblance; an unsubstantial image.

A false image formed in a telescope, camera, or other optical device by reflection from the surfaces of one or more lenses. (Can we verify this sense?)

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.

Ellipsis of ghostwriter.

A nonexistent person invented to obtain some (typically fraudulent) benefit.

A dead person whose identity is stolen by another (see ghosting). (Can we verify this sense?)

An unresponsive user on IRC, resulting from the user's client disconnecting without notifying the server.

A copy of a file or record.

An understudy. (Can we verify this sense?)

A covert (and deniable) agent.

A faint image that remains after an attempt to remove graffiti.

An opponent in a racing game that follows a previously recorded route, allowing players to compete against previous best times.

Someone whose identity cannot be established because there are no records of such a person. (Can we verify this sense?)

An unphysical state in a gauge theory.

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.

Ellipsis of ghost pepper.

A game in which players take turns to add a letter to a possible word, trying not to complete a word. (Can we verify this sense?)

White or pale.

Transparent or translucent.

Abandoned.

Remnant; remains.

Perceived or listed but not real.

Of cryptid, supernatural or extraterrestrial nature.

Substitute.

In the form be ghost: not present or involved; absent, gone.

1. 1. Of a disembodied soul: to appear (somewhere or to someone) in the form of an apparition; to haunt.
   2. To imbue (something) with a ghost-like effect or hue.
2. 1. To continuously cause (someone or something) trouble; specifically, to continuously be in the thoughts of (someone) in a disturbing manner; to perturb, to trouble.
   2. To kill (someone).
   3. 1. (Can we verify this sense?) To copy (a file or record).
      2. To gray out (a visual element) to indicate that it is unavailable.
      3. To forcibly disconnect (an IRC user) who is using one's reserved nickname.
   4. To stop communicating with (someone) on social media, though text messages, etc., without explanation, especially as a way of ending a relationship; hence, to end a relationship with (someone) by stopping all communication without explanation.
   5. To transfer (a prisoner) to another prison, usually without first informing the prisoner.
3. Synonym of ghostwrite (“to write (a literary work or speech), or produce (an artistic work)), in the place of someone”); also, to carry out (an artistic performance) in the place of someone.

1. Of a disembodied soul: to appear (somewhere or to someone) in the form of an apparition; to haunt.
2. To imbue (something) with a ghost-like effect or hue.

Of a disembodied soul: to appear (somewhere or to someone) in the form of an apparition; to haunt.

To imbue (something) with a ghost-like effect or hue.

1. To continuously cause (someone or something) trouble; specifically, to continuously be in the thoughts of (someone) in a disturbing manner; to perturb, to trouble.
2. To kill (someone).
3. 1. (Can we verify this sense?) To copy (a file or record).
   2. To gray out (a visual element) to indicate that it is unavailable.
   3. To forcibly disconnect (an IRC user) who is using one's reserved nickname.
4. To stop communicating with (someone) on social media, though text messages, etc., without explanation, especially as a way of ending a relationship; hence, to end a relationship with (someone) by stopping all communication without explanation.
5. To transfer (a prisoner) to another prison, usually without first informing the prisoner.

To continuously cause (someone or something) trouble; specifically, to continuously be in the thoughts of (someone) in a disturbing manner; to perturb, to trouble.

To kill (someone).

1. (Can we verify this sense?) To copy (a file or record).
2. To gray out (a visual element) to indicate that it is unavailable.
3. To forcibly disconnect (an IRC user) who is using one's reserved nickname.

(Can we verify this sense?) To copy (a file or record).

To gray out (a visual element) to indicate that it is unavailable.

To forcibly disconnect (an IRC user) who is using one's reserved nickname.

To stop communicating with (someone) on social media, though text messages, etc., without explanation, especially as a way of ending a relationship; hence, to end a relationship with (someone) by stopping all communication without explanation.

To transfer (a prisoner) to another prison, usually without first informing the prisoner.

Synonym of ghostwrite (“to write (a literary work or speech), or produce (an artistic work)), in the place of someone”); also, to carry out (an artistic performance) in the place of someone.

1. To appear suddenly or move like a disembodied soul; specifically ; also followed by the dummy subject it: to move easily and quietly without anyone noticing; to slip.
2. Followed by for: synonym of ghostwrite (“to write a literary work or speech, or produce an artistic work, in the place of someone”); also, to carry out an artistic performance in the place of someone.
3. Of a sailing vessel: to sail seemingly with very little or no wind.
4. Apparently only in the writings of the Dutch-English physician Gideon Harvey (c. 1636–1640 – c. 1700–1702): to die, to expire.

To appear suddenly or move like a disembodied soul; specifically ; also followed by the dummy subject it: to move easily and quietly without anyone noticing; to slip.

Followed by for: synonym of ghostwrite (“to write a literary work or speech, or produce an artistic work, in the place of someone”); also, to carry out an artistic performance in the place of someone.

Of a sailing vessel: to sail seemingly with very little or no wind.

Apparently only in the writings of the Dutch-English physician Gideon Harvey (c. 1636–1640 – c. 1700–1702): to die, to expire.

Source: wiktionary.org