Holy Spirit

Short definition from Wiktionary

Proper noun

1. 1
   The person (hypostasis) of the Trinity or Godhead corresponding to divine essence present in the faithful (particularly inspired prophets) and considered to proceed either from (Eastern Orthodoxy) God the Father alone or (Roman Catholicism) from Him together with God the Son.
2. 2
   The spirit of God, especially the gifts of wisdom and prophecy.
3. 3
   The spirit of God, especially in its inspiration of prophets and quickening of fetuses.
4. 4
   The archangel Gabriel.