ELEMENT

(SIMPLE SUBSTANCE) [noun] [C] - a simple substance which cannot be reduced to smaller chemical partsAluminium is an element.There are more than 100 elements.(old use) In the past, the elements were thought to be earth, air, fire and water from which people believed everything else was made.If you are in your element, you are happy because you are doing what you like or can do best.If you ask Kate to organize the party, she'll be in her element.If you are out of your element, you are unhappy and feel uncomfortable.He was out of his natural element in such a formal gathering.