Element

1. A fundamental, essential, or irreducible constituent of a composite entity. 2. The basic assumptions or principles of a subject. 3. A member of a set. 4. A point, line, or plane. 5. A part of a geometric configuration, such as an angle in a triangle. 6. The generatrix of a geometric figure. 7. Any of the terms in the rectangular array of terms that constitute a matrix or determinant. 8. A substance composed of atoms having an identical number of protons in each nucleus. Elements cannot be reduced to simpler substances by normal chemical means. 9. One of four substances, earth, air, fire, or water, formerly regarded as a fundamental constituent of the universe. 10. The resistance wire in an electrical appliance such as a heater or an oven. 11. outside paint that had been damaged by the elements. 12. He is in his element when traveling. The business world is her element. 13. the dissident element on campus. 14. The bread and wine of the Eucharist.