Lexical Definition

‎παραλλαγή‎ parallagḗ (par-al-lag-ay') variation ^G:N-F
from a compound of ‎παρά‎ and ‎ἀλλάσσω‎

variableness.

• transmutation (of phase or orbit), i.e. (figuratively) fickleness

Abbott-Smith

παρ-αλλαγή, -ῆς, ἡ (< παραλλάσσω), [in LXX: IV Ki 9:20 (שִׁגָּעוֹן)*;]
in various senses (LS, s.v.), change: Ja 1:17.†

Abbott-Smith References

Liddell-Scott-Jones

παραλλαγή-ᾰγή, ἡ,

passing from hand to hand, transmission, πυρὸς παραλλαγήαγαί [Refs 4th c.BC+]; change of position, movement, τὸ τάχος τῆς π., of the sun's apparent motion, [Refs 1st c.BC+]

__b Astrology texts, of a heavenly body, passing beyond the degree occupied by another, Antioch.Astr.in [Refs]
__2 alternation, μυῶν παραλλαγήαγαὶ καὶ νεύρων their alternate movements, [Refs 5th c.BC+]; παραλλαγήαγὰς τοῖς ποσὶν ἐποίουν, of dancers, [Refs 5th c.BC+]
__3 distortion of the vertebrae, [Refs 5th c.BC+]; contortion, twisting, of wood, [Refs 4th c.BC+]
__4 interchange, διανοίας πρὸς αἴσθησιν π. interchange of intellect and sense, putting one for the other, [Refs 5th c.BC+]; π. προσώπων, πτώσεως, [Refs 2nd c.AD+]
__II difference between things, ποιεῖν τινα π. εὐοσμίας καὶ ἀοσμίας [Refs 4th c.BC+]; μεγάλην ἔχειν π. [Refs 1st c.BC+]
__III variety, variation, [NT+4th c.BC+]; change of meaning, παραλλαγήαγῶν κατὰ σύμβολον γινομένων [Refs 3rd c.BC+]
__IV frenzy, madness, ἐν π. γενέσθαι [LXX]; π. ψυχῆς perturbation of soul, [Refs 4th c.AD+]

_{LSJ Scripture Refs: Jas.1.17}