Correct spelling, explanation: necessary derives from the Latin forms necesse or necessarius and the root of both words is cedere, which meant to go away. When it comes to English necessary entered the language in Middle English and in modern English necessary is widely used in both formal and informal contexts.

Definition of necessary:
1. adjective – something which is a must;
The apartment is fully furnished so you will find there all the necessary things.

Collocations with necessary:
A few commonly used collocations include: if necessary, consider something necessary, and absolutely necessary.
The red button is for emergency situations so press it only if necessary.
I consider it necessary to introduce a few changes to the project.
It’s absolutely necessary that you are on time as the bus won’t wait for you.

Incorrect spelling, explanation: necessary is a troublesome word in terms of spelling. The most common mistake is to spell necessary with a double -s letter instead of a double -c letter, which results in a wrong form nessacary. The correct spelling of necessary features a single -c letter and a double -s letter.

Incorrect spelling

Incorrect spelling

Incorrect spelling

Incorrect spelling

Incorrect spelling