Incorrect spelling


Incorrect spelling, explanation: this form is wrong as rehearsal comes from the word rehear (hear one more time), thus it needs to be spelled with ea. Rehersal may be closer to pronunciation, but is incorrect and the only correct form is rehearsal.

Correct spelling


Correct spelling, explanation: rehearsal is the correct spelling because the word’s origin is hear and later rehear (hear again). This is why we need to spell the word this way, and not rehersal (which is closer to pronunciation, yet incorrect). Rehearsal is the correct form.

Definition of rehearsal:
noun, a meeting to practice, usually before a public performance
I am exhausted! Our rehearsal today lasted 5 hours!
She is a very talented actress; she can go on stage and steal the show with little or no rehearsal.