Relativity

3. To become bent or twisted out of shape; to distort.
5. The universe seen as a well-ordered whole.
8. A measurable extent of some kind, such as length, breadth, depth, or time.
11. A particular attitude toward or way of regarding something; a point of view.
12. The quality or fact of occurring at the same time.
13. The force that attracts a body toward the center of the earth, or toward any other physical body having mass.
15. The underlying structure or framework of something complex (e.g., of society or spacetime).
17. Considered in relation or in proportion to something else; existing only by comparison.
19. The speed of something in a given direction.

1. The line at which the earth's surface and the sky appear to meet; or the limit of perception (Event...).
2. The rate of change of velocity per unit of time.
4. A situation or state of affairs that does not change; a number that is fixed.
6. A band of colors, as seen in a rainbow; used to classify something in terms of its position on a scale.
7. The path followed by a projectile flying or an object moving under the action of given forces.
9. A coherent, typically large body of matter with no definite shape; the quantity of matter.
10. Understood instantly without conscious reasoning; a gut feeling.
11. A particle representing a quantum of light or other electromagnetic radiation.
14. A seemingly absurd or self-contradictory statement that may prove to be true.
16. To become wider, larger, or more open; to expand (often used with time or pupils).
18. Universally valid; viewing something without relation to other things; independent.