In lang=en terms the difference between adapt and pertain
is that
adapt is to change oneself so as to be adapted while
pertain is to relate, to refer, be relevant to.
As verbs the difference between adapt and pertain
is that
adapt is to make suitable; to make to correspond; to fit or suit; to proportion while
pertain is to belong.
As an adjective adapt
is adapted; fit; suited; suitable.