Two is the number that comes after one and before three. It represents a pair of things.
From Old English "twā" or "twegen," from Proto‑Germanic "twai" and Proto‑Indo‑European "dwóh." It is one of the oldest and most stable number words in Indo‑European languages.
The idea of "two" shows up all over English in hidden ways: twin, twice, between, twist, and even twilight all carry that "two‑ness." Our brains are so tuned to pairs that we often describe the world in twos—light/dark, good/bad, on/off.
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