Extended Strong's Greek Lexicon (Abbott-Smith based)
to summarise
Usage: ἀνα-κεφαλαιόω, ῶ (see: κεφαλαιόω) [in Th., Al.: Psa.72:20 * ;] to sum up, gather up, present as a whole: mid., Rom.13:9, Eph.1:10 (on WH. see Lft., Notes, 321 L; AR, in l; Cremer, 354, 748).† (AS)