The ordinal number matching the number eight in a series.(noun)
One of eight equal parts.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "eighth" in a sentence
" The argument here is due to a misapprehension of the meaning of the term eighth in Psalm vi. and xi.title. cf.n. on De Sp.S. S: 66."
"Herodotus thought Homer lived "the day before yesterday" because he belonged to what we call the eighth century."
""Under such conditions," said I, "what we call the eighth commandment would be superfluous.""