The general condition of weather and atmospheric conditions in a region over a long period; climate, or a historical period or era.
From Latin 'clima,' from Greek 'klima' meaning 'slope' or 'inclination.' Ancient Greeks used this term because they understood that the sun's angle (slope of incidence) affected weather—the root concept behind modern climate science.
The word 'climate' comes from Greek observations about angles and slopes—the Greeks literally watched shadows change with latitude and deduced that Earth's tilt created different weather zones, inventing the concept we still use today.
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