Lexical Definition

‎πλάνη‎ plánē (plan'-ay) error G:N-F
feminine of ‎πλάνος‎ (as abstractly)

deceit, to deceive, delusion, error.

Usage: 4 forms in 13 verses
Form Translated As     In Verse(s)
πλάνῃ error 2Pet.2.18 • 2Pet.3.17 • Jude.1.11
πλάνησ delusion 2Thess.2.11
error Rom.1.27 • 1Thess.2.3 • Jas.5.20
of deceit Eph.4.14
of falsehood 1John.4.6
πλάνη a delusion LXX.Jer.23.17
deception Matt.27.64
delusion LXX.Prov.14.8
πλάναι Our delusions LXX.Ezek.33.10

Abbott-Smith

πλάνη, -ης, ἡ, [in LXX: Pr 14:8 (מִרְמָה), Wi 1:12, al;]
a wandering. Metaph., a going astray, an error (in NT always with respect to morals or religion): Mt 27:64, Ro 1:27, Eph 4:14, I Th 2:3, II Th 2:11, Ja 5:20, II Pe 2:18 3:17, I Jo 4:6, Ju 11.†

Abbott-Smith References

Book Refs
Proverbs 14:8
Matthew 27:64
Romans 1:27
Ephesians 4:14
1 Thessalonians 2:3
2 Thessalonians 2:11
James 5:20
2 Peter 2:18 · 3:17
1 John 4:6
Jude 1:11

Liddell-Scott-Jones

πλάνη-η, ἡ,

wandering, roaming, [Refs 5th c.BC+]

__2 discursive treatment, ἡ διὰ παντὸς διέξοδος καὶ π. [Refs 5th c.BC+]
__II metaphorically, going astray, βίοτος ἀνθρώπων π. [Refs 5th c.BC+]; ἡ περὶ τὰ χρώματα π. τῆς ὄψεως the illusion, [Refs]; πολλὴν ἔχει.. πλάνην irregularity, [Refs 4th c.BC+]; πολλὰς ἀπορίας ἔχει καὶ π. [Refs]; ἡ κατὰ τὰς αἰσθήσεις π. [Refs 4th c.BC+]
__II.2 deceit, imposture, [LXX+NT]

LSJ Scripture Refs: LXX.Prov.14.8 ☩ Matt.27.64