Element

an abstract part of something

an artifact that is one of the individual parts of which a composite entity is made up

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

the most favorable environment for a plant or animal

one of four substances thought in ancient and medieval cosmology to constitute the physical universe

the situation in which you are happiest and most effective

a straight line that generates a cylinder or cone