Nadir Nadir The nadir (, ; from / ALA-LC: "naẓīr", meaning "counterpart") is the direction pointing directly "below" a particular location; that is, it is one of two vertical directions at a specified location, orthogonal to a horizontal flat surface there. Since the concept of "being below" is itself somewhat vague, scientists define the nadir in more rigorous terms. Specifically, in astronomy, geophysics and related sciences (e.g., meteorology), the nadir at a given point is the local vertical direction pointing in the direction of the force of gravity at that location. The direction opposite the nadir is the zenith. Nadir is
Opposite (semantics) Opposite (semantics) In lexical semantics, opposites are words lying in an inherently incompatible binary relationship, like the opposite pairs "big : small", "long : short", and "precede : follow". The notion of incompatibility here refers to the fact that one word in an opposite pair entails that it is not the other pair member. For example, something that is "long" entails that it is not "short". It is referred to as a 'binary' relationship because there are two members in a set of opposites. The relationship between opposites is known as opposition. A member of a pair of opposites can