(used to express possibility)

It may rain.

(used to express opportunity or permission)

You may enter.

(used to express contingency, esp. in clauses indicating condition, concession, purpose, result, etc.)

I may be wrong but I think you would be wise to go. Times may change but human nature stays the same.

(used to express wish or prayer)

May you live to an old age.

Archaic . (used to express ability or power.)

verb

allowed , can , hawthorn , likelihood , might , must , permitted , possible , shrub , wish