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Related to zeroth: zeroth law of thermodynamics, COMETH, Zeroth dimension, Zeroth law
Of or relating to the ordinal number matching the number 0 in a series: the zeroth power of 10.
denoting a term in a series that precedes the term otherwise regarded as the first term
[C20: from zero + -th2]
coming in a series before the first: the zeroth level of energy.