Lexical Definition

‎ἁρπαγμός‎ harpagmós (har-pag-mos') something to grasp ^G:N-M
from ‎ἁρπάζω‎

robbery.

• plunder (properly concrete)

Abbott-Smith

*† ἁρπαγμός, οῦ, ὁ (< ἁρπάζω);
1. prop., acc., to the rule of its formation (Bl., § 27, 2), actively, the act of seizing, robbery (Plut., de Puer. Educ., p. 12A), Phl 2:6, AV (Waterland, Works, II, 108; Cremer, 649 f.; Meyer, in l.; cf. also JThS, July, 1909, April, 1911; MM, s.v.).
2. Passively = ἅρπαγμα (Ez 22:25, of a lion's prey, טֶרֶף), a thing seized, hence, a prize: Phl 2:6, RV (Lft., Ellic., ICC, in l.; Donaldson, NCrat., 450 ff.; and esp. Gifford, The Incarnation, 59-71, and reff. in DB, ii, 835 B). The lexical data favour the active meaning, but as they also admit the possibility of the alternative, most modern expositors have accepted the latter as seeming to suit the logic of the passage better. The lexical difficulty, however, remains (MM, s.v., esp. the last ref.). As to the usage of St. Paul, he seems inclined to adopt the -μα form where it is appropriate (e.g. Ro 11:9, where cf. LXX; I Co 13:9, II Co 1:9), and there is certainly a presumption in favour of the active meaning here from the fact that he does not use the LXX ἅρπαγμα. Suggestions looking to a fresh exegesis are given in JThS, July, 1909, April, 1911.†

Abbott-Smith References

Liddell-Scott-Jones

ἁρπαγμός-μός, ὁ,

robbery, rape, [Refs 1st c.AD+]

__2 concrete, prize to be grasped, [NT]

_{LSJ Scripture Refs: Phil.2.6}