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| the time required for one half the atoms of a given amount of a radioactive substance to disintegrate |
| a wave in which the direction of displacement is perpendicular to the direction of propagation, as a surface wave of water |
restitution res·ti·tu·tion (rěs'tĭ-t&oomacr;'shən, -ty&oomacr;'-)
n.
A return to or restoration of a previous state or position, especially the return of the rotated head of a fetus to its natural alignment with the body after delivery.