This unglossed headword (a marginal addition in ms M) was initially printed by Adler as a one-word contraction of kata/ and u(/par, i.e. combined in analogy to words like kaqa/per, kaqa/pac, etc. In her addenda and corrigenda, however, she modified this to the usual phrase kaq' u(/par.
u(/par is the reality of the waking world, as opposed to dreams; see upsilon 155, upsilon 156, and LSJ s.v.