May

verb

1. To be strong; to have power (over).
2. (auxiliary) To be able; can.
3. To be able to go.
4. (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?"

5. (modal auxiliary verb, defective) Expressing a present possibility; possibly.

   "he may be lying;  Schrödinger's cat may or may not be in the box"