zeroth

listen to the pronunciation of zeroth
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: In the first position in a sequence whose elements are numbered starting at zero; the ordinal number corresponding to zero

The zeroth order polynomial approximation is constant.

Corresponding to a position preceding the first

A and C are in equilibrium following the Zeroth Law of Thermodynamics.

In the first position in a sequence whose elements are numbered starting at zero; the ordinal number corresponding to zero
{s} being 0 in number, zero, initial item of a sequence; of or pertaining to zero; first, enumeration that starts with zero (Computer Jargon)
preceding even the first
zeroth law of thermodynamics
the law that if two bodies are in thermal equilibrium with a third body then the first two bodies are in thermal equilibrium with each other