  Octet baryon axial, induced pseudoscalar, and pseudoscalar form factors are
computed using a symmetry-preserving treatment of a vector$\,\times\,$vector
contact interaction (SCI), thereby unifying them with an array of other baryon
properties and analogous treatments of semileptonic decays of pseudoscalar
mesons. The baryons are treated as quark--plus--interacting-diquark bound
states, whose structure is obtained by solving a Poincar\'e-covariant Faddeev
equation. The approach is marked by algebraic simplicity, involves no free
parameters, and since it is symmetry preserving, all consequences of partial
conservation of the axial current are manifest. It is found that SCI results
are consistent with only small violations of SU$(3)$-flavour symmetry, an
outcome which may be understood as a dynamical consequence of emergent hadron
mass. The spin-flavour structure of the Poincar\'e-covariant baryon wave
functions is expressed in the presence of both flavour-antitriplet scalar
diquarks and flavour-sextet axialvector diquarks and plays a key role in
determining all form factors. Considering neutral axial currents, SCI
predictions for the flavour separation of octet baryon axial charges and,
therefrom, values for the associated SU$(3)$ singlet, triplet, and octet axial
charges are obtained. The results indicate that at the hadron scale,
$\zeta_{\cal H}$, valence degrees-of-freedom carry roughly 50% of an octet
baryon's total spin. Since there are no other degrees-of-freedom at
$\zeta_{\cal H}$, the remainder may be associated with quark+diquark orbital
angular momentum.
