[n] an artifact that is one of the individual parts of which a composite entity is made up; especially a part that can be separated from or attached to a system; "spare components for cars"; "a component or constituent element of a system"
[n] the most favorable environment for a plant or animal; "water is the element of fishes"
[n] a straight line that generates a cylinder or cone
[n] the situation in which you are happiest and most effective; "in your element"
[n] any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
[n] one of four substances thought in ancient and medieval cosmology to constitute the physical universe; "the alchemists believed that there were four elements"