(perhaps dated) In a manner than pertains to an affinity; familiarly; understandingly; similarly.
The coal, oxygen of the air affinitatively flies to the particles of pure carbon left behind.
And I may now further observe, that every dichotomy of the tables, if viewed and taken with the root (or semi-dichotomy) from which it immediately proceeds, may be considered as a sort of triangular circle returning affinitatively into itself: and that the two further dichotomies issuing from each of its branches may be also considered as forming with it a still larger and broader-based triangular or pyramidal circle.
Solutions in which the velocity profile along the Wall is only affinitatively distorted.