noun

• (now chiefly literary) A girl or an unmarried young woman.
• (archaic) A female virgin.
  "She's unmarried and still a maiden."
• (obsolete, dialectal) A man with no experience of sex, especially because of deliberate abstention.
  "As for that ſaid ſire Bors I wille be ſhryuen with a good wylle / Soo ſyr Bors was confeſſyd / and for al wymmen ſir Bors was a vyrgyne / ſauf for one / that was the doughter of kynge Brangorys / and on her he gat a child that hyghte Elayne / and ſauf for her ſyre Bors was a clene mayden[…]"
• (now rare) An unmarried woman, especially an older woman.

adj

• (of a female, human or animal) Without offspring.
• (figuratively) Being a first occurrence or event.
  "1975 was the year when West Indies won their maiden World Cup title."
• (cricket) Being an over in which no runs are scored.
  "He bowled a record twelve maiden overs in his spell of 8-33 in 21 overs."
• (of a fortress) Never having been captured or violated.
  "Victorie forsook him for ever since he ransacked the maiden town of Magdenburg"

noun

• (Wicca) One of the triune goddesses of the Lady in Wicca alongside the Crone and Mother representing a girl or a young woman
  "[…] different stages of life as represented by our Lady as Maiden, Mother, and Crone, as well as our Lord as Master, Father, and Sage."