2709. katachthonios
Lexical Summary
katachthonios: Under the earth, subterranean

Original Word: καταχθόνιος
Part of Speech: Adjective
Transliteration: katachthonios
Pronunciation: kat-akh-thon'-ee-os
Phonetic Spelling: (kat-akh-thon'-ee-os)
KJV: under the earth
NASB: under the earth
Word Origin: [from G2596 (κατά - according) and chthon (the ground)]

1. subterranean, i.e. infernal (belonging to the world of departed spirits)

Strong's Exhaustive Concordance
under the earth.

From kata and chthon (the ground); subterranean, i.e. Infernal (belonging to the world of departed spirits) -- under the earth.

see GREEK kata

NAS Exhaustive Concordance
Word Origin
from kata and chthón (the earth)
Definition
under the earth
NASB Translation
under the earth (1).

Thayer's Greek Lexicon
STRONGS NT 2709: καταχθόνιος

καταχθόνιος, καταχτονιον (κατά (see κατά, III. 3), χθών (the earth)), subterranean, Vulg.infernus: plural, of those who dwell in the world below, i. e. departed souls (cf. Winers Grammar, § 34, 2; but others make the adjective a neuter used indefinitely; see Lightfoot, in the place cited), Philippians 2:10. (Homer, Dionysius Halicarnassus, Anthol., etc., Inscriptions)

Topical Lexicon
Biblical context

The word appears once in the New Testament, Philippians 2:10, within Paul’s exaltation hymn: “that at the name of Jesus every knee should bow, in heaven and on earth and under the earth” (Berean Standard Bible). The phrase “under the earth” completes a three-fold cosmic scope—heavenly beings, living humanity, and those beneath—underscoring the universal reach of Christ’s lordship.

Old Testament and Jewish background

Hebrew Scripture speaks of Sheol as the realm of the departed (Psalm 6:5; Isaiah 14:9). Later Jewish writings expand this into a stratified cosmos of heaven, earth, and the abyss. While Hebrew lacks a direct lexical parallel to Strong’s 2709, the conceptual groundwork is present in texts such as Job 26:5-6 and 1 Samuel 28:13-15. Paul’s use draws on this heritage, presenting Jesus as sovereign even where death appears to reign.

Greco-Roman setting

Greco-Roman religion populated the subterranean world with chthonic deities and the shades of the dead. By employing a term familiar to his Gentile audience yet filling it with distinctly biblical theology, Paul proclaims Christ’s supremacy over all unseen powers—demythologizing pagan fears while affirming the reality of spiritual realms (compare Colossians 2:15).

Theological significance

1. Christ’s universal dominion: Philippians 2:10 parallels Revelation 5:13—“every creature in heaven and on earth and under the earth and on the sea…”—showing that no creature or domain lies outside His authority.
2. Victory over death and Hades: Jesus’ descent “into the lower parts of the earth” (Ephesians 4:9) and His possession of “the keys of Death and Hades” (Revelation 1:18) demonstrate that the under-earth realm is already conquered territory.
3. Comprehensive worship: Both angelic hosts and deceased humanity will participate in the confession that “Jesus Christ is Lord” (Philippians 2:11), fulfilling Isaiah 45:23.

Eschatological horizons

At the final judgment, “the sea gave up its dead, and Death and Hades gave up their dead” (Revelation 20:13). The mention of those “under the earth” anticipates that day, guaranteeing that the subterrestrial world cannot withhold homage or escape accountability.

Ministry application

• Evangelism: Believers proclaim a Savior whose authority extends beyond life’s limits, offering hope to all who fear death (Hebrews 2:14-15).
• Worship: Corporate liturgy joins a vast, unseen congregation, echoing heaven’s praise and anticipating universal confession.
• Pastoral comfort: Those grieving the loss of loved ones are reminded that the dead are not beyond Christ’s care, and resurrection is certain (1 Thessalonians 4:14).
• Spiritual warfare: Confidence in Christ’s supremacy empowers believers to resist demonic oppression, knowing every subterranean power is already subject to Him (James 4:7).

Summary

Strong’s Greek 2709 highlights the final sphere of Christ’s absolute reign. By affirming that even the under-earth realm must bow to Jesus, Scripture assures the Church of His total victory, motivates mission to every corner of creation, and fills worship with cosmic expectancy.

Forms and Transliterations
καταχθονιων καταχθονίων katachthonion katachthoniōn katachthoníon katachthoníōn
Links
Interlinear GreekInterlinear HebrewStrong's NumbersEnglishman's Greek ConcordanceEnglishman's Hebrew ConcordanceParallel Texts
Englishman's Concordance
Philippians 2:10 Adj-GMP
GRK: ἐπιγείων καὶ καταχθονίων
NAS: and on earth and under the earth,
KJV: and [things] under the earth;
INT: on earth and under the earth

Strong's Greek 2709
1 Occurrence


καταχθονίων — 1 Occ.

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