accidental : An accidental event happens by chance or as the result of an accident, and is not deliberately intended.
adj. accidental falling is very embarrassing
assemble: When people assemble or when someone assembles them, they come together in a group, usually for a particular purpose such as a meeting.
verb some new neighbors moved into my house but they are always armed
calculate:If you calculate a number or amount, you discover it from information that you already have, by using arithmetic, mathematics, or a special machine.
verb I calculate the square root of 121
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