Correct spelling


Correct spelling, explanation: mandatory is an adjective from the verb and noun mandate, which is also spelled with a, not i after consonant d. The word’s origin is Latin, in which spelling is also similar. Therefore mandatory is the correct form, not manditory.

Definition of mandatory:
adjective, obligatory; must be done due to a rule
It is mandatory to wear a mask in our store.
There is a mandatory test before applying to the position.

Incorrect spelling


Incorrect spelling, explanation: manditory is a spelling mistake because the word is spelled with a after d: mandatory. It is due to Latin origin mandatum, and later English noun mandate. This shows why mandatory is the correct form.