Correct spelling, explanation: the word anniversary comes from Latin word annus (genitive anni), meaning a year. That is why we spell anniversary with double n, not one.
Aniversary is a misspelling, because origin of the word point to double n.
Definition of anniversary:
noun, annual recurrence of an event, a celebration of an important past event
We are going to Greece for our wedding 1st anniversary.
Major gave a speech during the anniversary celebrations.
Incorrect spelling, explanation:
aniversary is a wrong form, because anniversary should be spelled with double n due to its roots. Latin word annus, which means year, and is a core word for anniversarium is spelled with double n, just like later, English, anniversary.
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