The unglossed headword is a feminine noun in the nominative (and vocative) singular. This spelling, in which the Suda follows Polybius (see n. 2 below), is an alternative to megalome/reia (lavishness, munificence; see LSJ s.v.).
The word's additional meaning, largeness of parts or scale, appears to be illustrated in the latter part of the entry (see nn. 3-4 below).
cf. mu 366.
[1] One myriad (mu/rioi) is ten thousand, so this represents one hundred and fifty thousand soldiers (Smyth §347).
[2] Polybius 1.26.8-9 (web address 1), describing the Carthaginian mobilization (256 BCE) for the Battle of Ecnomus (Eknomos; Barrington atlas map 47 grid D4), a hill near the town of Phintias (present-day Licata, Italy), on Sicily's southern coast (Lazenby, p. 84). Walbank suggests that Carthage was pursuing a defensive strategy and that Polybius' reckoning of the troop count from ship numbers is therefore exaggerated (Walbank, p. 86). However, Lazenby (op. cit., pp. 86-7) favors Polybius' account, together with his arithmetic; Ecnomus was arguably the largest sea-battle in history.
[3] Gregory of Nazianzus, In sancta lumina PG 36.344.12, with scholion.
[4] The Council of Nicaea (325 CE) defined the relationship between the persons (hypostases) of the Christian Trinity as o(moou/sion, consubstantial. See LSJ s.v.; OCD(4) s.v. Nicaea (1); and related Suda passages alpha 3397, beta 150, gamma 450, epsilon 3782, lambda 256, and omicron 762.