What is the meaning of outing?

noun

• A journey taken for pleasure.
  • usage: "many summer excursions to the shore"; "it was merely a pleasure trip"; "after cautious sashays into the field"
  • synonyms: excursion, jaunt, junket, pleasure trip, expedition, sashay
• A day devoted to an outdoor social gathering.
  • synonyms: field day, picnic

verb

• To state openly and publicly one's homosexuality.
  • usage: "This actor outed last year"
  • synonyms: come out of the closet, out, come out
• Reveal (something) about somebody's identity or lifestyle.
  • usage: "The gay actor was outed last week"; "Someone outed a CIA agent"
  • synonyms: out
• Be made known; be disclosed or revealed.
  • usage: "The truth will out"
  • synonyms: out, come out