May
Possibility:
Synonyms Might, Can, Perhaps, It is possible, Conceivably, Could, Possibly, Perchance, There's a chance, and Potentially.
Permission:
Synonyms Is allowed, Is permitted, Can be given leave to, Is free to, Has the option to, Has the liberty to, Is authorized to, Has the right to, Is entitled to, and Allowed to.
Probability or Politeness
Synonyms Likely, Mayhap, As it might be, Maybe, Plausibly, Probably, Feasibly, Possibly so, In all likelihood, and Could be.
Example Sentences
May I borrow your book for today?
She may join us for dinner tonight.
The weather may change later this evening.
He may not be able to attend the meeting.
May the best team win the competition!