ἀγαλλιάω, -ῶ, Hellenistic form of cl. ἀγάλλω, to glorify, mid. -ομαι, to exult in;
[in LXX (most frequently in Pss.) chiefly for גיל, רנן pi. ;]
to exult, rejoice greatly: before ἐπί, with dative, Luk.1:47; with dative mod., 1Pe.1:8, Rev.19:7. Mid., with same sense: Mat.5:12, Luk.10:21, Act.2:26, 16:34, 1Pe.4:13; before ἵνα, Jhn.8:56; ἐν, Jhn.5:35 (1 aor. pass. perh. as mid.; but see Mozley, Psalter, 5), 1Pe.1:6 (Cremer, 590).†
(AS)