to fasten or fix (something) by piercing or thrusting in
to instil or inculcate (a lesson, moral values, etc)
in grammar, to insert (an affix) in the middle of a word or root
infixation /-ʹsaysh(ə)n/ noun
[Latin infixus, past part. of infigere, from in-2 + figere to fasten]