| deceleration | 1. The act of decelerating. 2. The rate of decrease in velocity per unit of time. (05 Mar 2000) |
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| variable deceleration | Transient foetal bradycardia usually denoting compression of the umbilical cord which may occur at any time in relation to a uterine contraction. (05 Mar 2000) |
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| early deceleration | Slowing of the foetal heart rate early in the uterine contraction phase, denoting compression of the foetal head. (05 Mar 2000) |
| late deceleration | Any transient foetal bradycardia, the nadir of which occurs after the peak of the uterine contraction. (05 Mar 2000) |