Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
rĕlātīvē, adv., v. relativus fin.
rĕlātīvus, a, um, adj. [refero], having reference or relation, referring, relative (post-class.), Arn. 7, p. 221: qualitas, Mart. Cap. 5, § 451: appellatio, Aug. Trin. 5, 16.
In gram.: pronomen, Prisc. p. 1063 sq. P.
Adv.: rĕlātīvē, relatively: vicinus et amicus relative dicuntur, Aug. Trin. 5, 71.