The official name of Zaire.

The official name of Zambia.

zero gravity

The point, during childbirth, at which the baby's head is level with the ischial spines in the maternal pelvis.

plural of New Zealand spinach

A plant whose leaves are used as spinach-like greens, Tetragonia tetragonioides

(grammar) The absence of an ending after a noun‐stem in a language in which endings are normally applied; often written as ∅

(mathematics) The fact that, in some circumstances, the probability of an event can only be zero or one and not any intermediate value.

(education) A high school class that is offered early in the morning, before the scheduled start of the school day.

A species of falcon endemic to New Zealand, Falco novaeseelandiae.