Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
cŏ-apto, no perf., ātum, 1, v. a., to fit, join, adjust together with something (eccl. Lat.; cf. Lachm. ad Lucr. 2, pp. 135 and 248), Aug. Doctr. Christ. 1, 14; Prud. Psych. 557.