Correct spelling, explanation: an English word necessary comes from the Latin words necesse and necessarius. However, the root of these words is another Latin form, which is cedere and could be translated as to go away. Necessary appeared in the English language in late Middle English. Today, it is a commonly used adjective.

Definition of necessary:
1. adjective – something which is needed;
It’s just a three-day long trip so take only the necessary things.

Expressions with necessary:
A few common expressions with necessary include: necessary evil (when something isn’t pleasant but is needed to achieve something), necessary condition, and necessary skill.
I prefer walking and I treat driving a car just as a necessary evil because it’s simply faster to get everywhere by car than on foot.
Passing a language test is a necessary condition if you want to apply for this job.
The job involves a lot of foreign travels, so speaking English is a necessary skill.

Incorrect spelling, explanation: necessary is probably one of the most commonly misspelled words in English. What causes confusion is the amount of the -c and -s letters. In the correct version, there is one -c letter and a double -s letter. However, many users of English mix that and they spell necessary as nessacary, which is absolutely unacceptable.

Incorrect spelling

Incorrect spelling

Incorrect spelling

Incorrect spelling

Incorrect spelling