zeroth
Pronunciation:
/ˈzɪəɹəʊθ//ˈzi(ˌ)ɹoʊθ/adjective
Definitions
In the initial position in a sequence whose elements are numbered starting at zero; the ordinal number corresponding to zero.
Example: The zeroth order polynomial approximation is constant.
Corresponding to a position preceding the first.
Example: A and C are in equilibrium following the Zeroth Law of Thermodynamics.