prefatorily

enUK

pref·a·to·ry

P0519300 (prĕf′ə-tôr′ē)adj. Of, relating to, or constituting a preface; introductory. See Synonyms at preliminary.
[From Latin praefātus, past participle of praefārī, to say before; see preface.]
pref′a·to′ri·ly adv.