Etymology
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-ical 
compound adjectival word-forming element, usually interchangeable with -ic but sometimes with specialized sense (such as historic/historical, politic/political), Middle English, from Late Latin -icalis, from Latin -icus + -alis (see -al (1)). Probably it was needed because the forms in -ic often took on a noun sense (for example physic). Forms in -ical tend to be attested earlier in English than their twins in -ic.
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whimsical (adj.)
1650s, from whimsy + -ical. Related: Whimsically.
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astrological (adj.)
"pertaining to astrology," 1590s; see astrology + -ical. Related: Astrologically.
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anthropological (adj.)
1786, from anthropology + -ical. Related: Anthropologically.
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gynecological (adj.)
also gynaecological, 1858, from gynecology + -ical. Related: Gynecologically.
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phonological (adj.)

"of or pertaining to phonology," 1800, from phonology + -ical. Related: Phonologically.

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symmetrical (adj.)
1751, from symmetry + -ical. Related: Symmetrically (1570s).
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geological (adj.)
1791, from geology + -ical. Related: Geologically.
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