I·sa·iah 1 (?-z???, ?-z???) A Hebrew prophet of the eighth century bc.[Late Latin ?saias, from Hebrew y??a’y?hû, salvation of Yahweh : y??a’, salvation; see w?? in Semitic roots + y?hû, Yahweh; see hwy in Semitic roots.]I·sa·iah 2 (?-z???, ?-z???)n. See Table at Bible.[After Isaiah.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.Isaiah (a??za??) n1. (Bible) the first of the major Hebrew prophets, who lived in the 8th century bc2. (Bible) the book of his and others’ propheciesCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014I?sa?iah (a??ze? ?; esp. Brit. a??za? ?) n. 1. a Major Prophet of the 8th century B.C. 2. a book of the Bible bearing his name. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.