Quick Definition
certainly
Strong's Definition
an enclitic particle of asseveration by way of contrast; in sooth
Derivation: probably for the dative case of G3588 (ὁ);
KJV Usage: (used only with other particles in the comparative, as G2544 (καίτοιγε), G3305 (μέντοι), G5105 (τοιγαροῦν), G5106 (τοίνυν), etc
Thayer's Greek Lexicon
τίω, a form front which some N. T. lexicons (e. g. Wahl, Bretschneider, Robinson, Bloomfield, Schirlitz, Harting, others) incorrectly derive τίσουσιν in 2Th_1:9; see τίνω.
Mounce Concise Greek Dictionary
not given
Abbott-Smith Greek Lexicon
τοί
Probably for the dative case of G3588
STEPBible — Tyndale Abridged Greek Lexicon
1. enclit. Particle, serving to express belief in an assertion, let me tell you, surely, verily , used to express an inference, then, consequently , (Homer); and in [variant datesTragica Adespota , to introduce a general sentiment.
2. to strengthen other Particles, γάρ τοι, ἤτοι, καίτοι, μέντοι, τοιγάρτοι, etc.: compare τἆρα, τἄν, μεντἄν. (ML)