What is the meaning of ha?

noun

• Astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing; the right ascension for an observer at a particular location and time of day.
  • synonyms: hour angle
• The state of being or appearing to be actively engaged in an activity.
  • usage: "they manifested all the busyness of a pack of beavers"; "there is a constant hum of military preparation"
  • synonyms: busyness, hum
• An Islamic fundamentalist group in Pakistan that fought the Soviet Union in Afghanistan in the 1980s; now operates as a terrorist organization primarily in Kashmir and seeks Kashmir's accession by Pakistan.
  • synonyms: Harkat-ul-Mujahidin, HUM, Harkat ul-Ansar, HUA, Harkat ul-Mujahedeen, Al Faran, Movement of Holy Warriors
• A humming noise.
  • usage: "the hum of distant traffic"
  • synonyms: hum, humming