Etymology: < deductionn. + -alsuffix1.Previous versions of the OED give the stress as: deˈductional.
rare.
Of, pertaining to, or of the nature of deduction.
ΚΠ
1683 E. Hooker in J. Pordage Theologia Mystica Pref. Epist. 44 As for Doctrines Traditional, Superstitional, and Deductional, these are (world !) without end.
This entry has not yet been fully updated (first published 1894; most recently modified version published online June 2019).