deviational en · ADJ
Etymology
From deviation + -al.
Meanings
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(not-comparable) Of, pertaining to, involving or inclining toward some form of deviation.
The verbs which diner in the perfect and the supine may be called deviational, as in a marked way deviating (de, from, and via, a way) from the ordinary forms, and those that are without certain parts may be termed defective (de, from, and facio, I make).
1856, John R. Beard, “Lessons in Latin”, in The Popular Educator, volume 2, page 70: