Princeton's WordNet

1. eighth(noun)

   position eight in a countable series of things

2. one-eighth, eighth(adj)

   one part in eight equal parts

3. eighth, 8th(adj)

   coming next after the seventh and just before the ninth in position

Kernerman English Learner's Dictionary

1. eighthɪtθ, eɪθ

   in the number 8 position

   the eighth time I called her; eighth on the list

2. eighthɪtθ, eɪθ

   one of eight equal parts

   Cut the cake into eighths.

Wiktionary

1. eighth(Noun)

   (eighth ones is used for the plural) The person or thing in the eighth position.

2. eighth(Noun)

   One of eight equal parts of a whole.

3. eighth(Noun)

   An "eighth" of an ounce equalling approximately 3.5 grams in marijuana or other drugs.

4. eighth(Adjective)

   The ordinal form of the number eight.

Webster Dictionary

1. Eighth(adj)

   next in order after the seventh

2. Eighth(adj)

   consisting of one of eight equal divisions of a thing

3. Eighth(noun)

   the quotient of a unit divided by eight; one of eight equal parts; an eighth part

4. Eighth(noun)

   the interval of an octave

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