verb

• (obsolete, intransitive) To be strong; to have power (over).
• (obsolete, auxiliary) To be able; can.
  "But many times[…]we give way to passions we may resist and will not."
• (intransitive, poetic) To be able to go.
  "O weary night, O long and tedious night, Abate thy houres, shine comforts from the East, That I may backe to Athens by day-light […]."
• (modal auxiliary verb, defective) To have permission to, be allowed. Used in granting permission and in questions to make polite requests.
  "you may smoke outside;   may I sit there?"

verb

• (poetic, intransitive) To gather may, or flowers in general.
  "Soo it befelle in the moneth of May / quene Gueneuer called vnto her knyȝtes of the table round / and she gafe them warnynge that erly vpon the morowe she wold ryde on mayeng in to woodes & feldes besyde westmynstre. "So it befell in the month of May, Queen Guenever called unto her knights of the Table Round; and she gave them warning that early upon the morrow she would ride a-Maying into woods and fields beside Westminster.""
• (poetic, intransitive) To celebrate May Day.

noun

• (archaic) A maiden.