Liddell-Scott-Jones

πλατυσμός (platusmos) an enlargement ^G:N-M

πλατυσμός-μός, ὁ,

widening, enlarging, dilatation, distension, [Refs 1st c.AD+]; ἐξήνεγκέ με εἰς πλατυσμόςμόν into broad space, into open ground, [LXX]; ἐν πλατυσμόςμῷ[LXX]

__II metaphorically, boasting, bragging, πουλυμαθημοσύνης [Refs]
__II.2 amplitude, τῆς ποιήσεως [Refs]

_{LSJ Scripture Refs: LXX.2Kgs.22.20*}