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 ).

Middle English < Latin -icālis. See -ic, -al1

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World English Dictionary
suffix forming adjectives
a variant of -ic : economical; fanatical
[from Latin -icālis]
suffix forming adverbs

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

adj. suffix, mostly the same as -ic but sometimes with specdialized sense (e.g. historic/historical), M.E., from L.L. -icalis, from L. -icus + -alis.
Online Etymology Dictionary, © 2010 Douglas Harper
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