Eighth definitions

ātth, āth
The ordinal number matching the number eight in a series.
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One of eight equal parts.
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Preceded by seven others in a series; 8th.
adjective
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Designating any of the eight equal parts of something.
adjective
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The one following the seventh.
noun
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Any of the eight equal parts of something;18
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noun
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In the eighth place, rank, group, etc.
adverb
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The ordinal form of the number eight.
adjective
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8th, 8th; (in names of monarchs and popes) VIII.
abbreviation
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(eighth ones is used for the plural) The person or thing in the eighth position.
noun
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One of eight equal parts of a whole.
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(slang) An "eighth" of an ounce equalling approximately 3.5 grams in marijuana or other drugs.
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Origin of eighth

Middle English eighthe from Old English eahtotha from eahta eight oktō(u) in Indo-European roots