Bailly
vb. de συνάγω, HPC. 51, 29 ; PLAT. Rsp. 537 c ; ARSTT. Rhet. 1, 15, 33, etc.
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LSJ
(< συνάγω) one must bring together or collect, μαθήματα εἰς σύνοψιν Pl. R. 537c; τὴν λιγνύν Dsc. 1.77; one must reduce, εἰς ὀλίγα καὶ κοινά Arist. Pol. 1319b24; one must unite a wound, ῥαφῇ Antyll. ap. Aët. 7.74.
one must conclude, ὅτι… Arist. Rh. 1377b6, cf. Hp. Hum. 18.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)