Why the word mission has double s?

The word "mission" has only one "s". It's a common spelling mistake to add an extra "s" but there is only one.

Here's the breakdown:

* "Mission" comes from the Middle French word "mission," meaning "sending" or "dispatching."

* "Mission" was adopted into English in the 15th century.

* The word has always been spelled with only one "s."

The double "s" spelling is a common error, likely due to the similar-sounding word "missiles."