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Webster 1913 Edition

Adj.

Not mechanical.

[Obs.]

Cheyne.

–

Im′me-chan′ic-al-ly

adv.

[Obs.]

Adj.

[in and mechanical.] Not consonant to the laws of mechanics.

immechanical ‎(comparative more immechanical, superlative most immechanical)

(obsolete) Not mechanical.
(Can we find and add a quotation of Cheyne to this entry?)