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-ical

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  1. a combination of -ic and -al1, used in forming adjectives from nouns (rhetorical), providing synonyms to words ending in -ic (poetical), and providing an adjective with additional meanings to those in the -ic form (economical).
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Origin of -ical

Middle English < Latin -icālis. See -ic, -al1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for -ical

-ical

suffix forming adjectives
  1. a variant of -ic economical; fanatical
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Derived Forms-ically, suffix forming adverbs

Word Origin

from Latin -icālis
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for -ical

adjectival suffix, mostly the same as -ic but sometimes with specialized sense (e.g. historic/historical), Middle English, from Late Latin -icalis, from Latin -icus + -alis.

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Online Etymology Dictionary, © 2010 Douglas Harper