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physics

Word physics originates from Greek word Φυσική (fysiki meaning physics).
The word in Greek originates from word Φύση (Fysi , which means nature).
In this funny video from Big Bang Theory show declares that comes from word Fysika that is true as in Ancient Greek the works about physics named Fysika and meant physical phenomena.

So the science to understand  the laws of Nature is physics.

Etymology and Origin of word Cosmology

The word “cosmology” comes from the Greek word “κοσμολογία” (kosmologia), which itself is derived from two Greek words: “κόσμος” (kosmos) meaning “world” or “universe,” and “λόγος” (logos) meaning “word,” “study,” or “discourse.” The term “κόσμος” in ancient Greek not only referred to the universe but also had connotations of order and harmony.

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