-ics, -tics [-ac after i]

1. A science (or group of related sciences) dealing with the logic of quantity and shape and arrangement.
2. The study of the measurement, properties, and relationships of quantities and sets, using numbers and symbols.
3. The systematic treatment of magnitude, relationships between figures and forms, and relations between quantities expressed symbolically.

The etymology of mathematics.

1. The branch of physics that deals with light and vision; primarily, the generation, propagation, and detection of electromagnetic radiation having wavelengths greater than x-rays and shorter than microwaves.
2. When referring to a singular noun, it means, the study of light or electromagnetic radiation in the visible, infrared, and ultraviolet regions.
3. As a plural noun, it refers to instruments used for detecting electromagnetic radiation and for attaining highly accurate long-range vision.

1. The scientific study of matter, energy, force, and motion, and the way they relate to each other (takes a singular verb).
2. When used as a plural form with a plural verb: physical properties, interactions, processes, or laws; such as, "The physics of astronomy have become more important."

Physics traditionally incorporates: acoustics, mechanics, optics, electromagnetism, electromagnetism, thermodynamics; and now also includes modern disciplines; such as, quantum mechanics, relativity, cryogenics, solid-state physics, particle physics, plasma physics, and nuclear physics.

A description of of any disease or condition marked by numerous remissions and exacerbations (increase the severities of or making worse).