To fit together tightly so that the parts lock or mesh with each other, or to be closely connected or dependent.
From 'inter-' meaning 'between' and 'lock,' combining to mean 'to lock together,' first used in the 1600s.
LEGO bricks succeed partly because they interlock with mechanical precision—each brick has nearly identical dimensions so any brick connects with any other, a design principle so successful it became one of history's best-selling toys.
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