126. aidios
Lexical Summary
aidios: Eternal, everlasting

Original Word: ἀΐδιος
Part of Speech: Adjective
Transliteration: aidios
Pronunciation: ah-ee'-dee-os
Phonetic Spelling: (ah-id'-ee-os)
KJV: eternal, everlasting
NASB: eternal
Word Origin: [from G104 (ἀεί - always)]

1. (forward and backward) eternal
2. (forward only) everlasting

Strong's Exhaustive Concordance
eternal, everlasting.

From aei; everduring (forward and backward, or forward only) -- eternal, everlasting.

see GREEK aei

NAS Exhaustive Concordance
Word Origin
from aei
Definition
everlasting
NASB Translation
eternal (2).

Thayer's Greek Lexicon
STRONGS NT 126: ἀΐδιος

ἀΐδιος, (for ἀείδιος from ἀεί), eternal, everlasting: (Wis. 7:26) Romans 1:20; Jude 1:6. (Homer hymn. 29, 3; Hesiod scut. 310, and from Thucydides down in prose; (frequent in Philo, e. g.de profug. § 18 (ζῶν ἀΐδιος), § 31;de opif. mund. § 2, § 61;de cherub. § 1, § 2, § 3;de post. Cain. § 11 at the end, Synonym: see αἰώνιος).)

Topical Lexicon
Scope of Usage

The adjective translated “eternal” or “everlasting” occurs only twice in the Greek New Testament, yet each instance anchors a major biblical theme—God’s timeless power (Romans 1:20) and the irreversible confinement of rebellious angels (Jude 1:6).

Romans 1:20 – God’s Boundless Power Revealed

“For since the creation of the world God’s invisible qualities—His eternal power and divine nature—have been clearly seen, being understood from His workmanship, so that men are without excuse.” (Romans 1:20)

1. Revelation through Creation
• The verse links eternity directly to the visible order of nature. Mountains, galaxies, and the laws of physics silently preach that the One behind them is limitless and unoriginated.
• Paul presents this as universally accessible revelation. Every person, regardless of culture, encounters evidence of God’s endless power and is therefore accountable.

2. Apologetic Value
• Christian apologetics often draw on this text to argue that the universe’s beauty and fine-tuning point to an eternal Creator rather than blind chance.
• The adjective “eternal” safeguards against any view that God evolved with the cosmos; He precedes it and sustains it.

3. Worship Implications
• Knowing that God’s power is eternal evokes trust and humility. Congregational worship often celebrates God as “everlasting” precisely because Scripture grounds that title in His unchanging power.

Jude 1:6 – Eternal Chains for Fallen Angels

“And the angels who did not stay within their own domain but abandoned their proper dwelling, these He has kept in eternal chains under darkness, bound for judgment on that great day.” (Jude 1:6)

1. Certainty of Judgment
• Jude contrasts angelic rebellion with the surety of their confinement. The adjective underscores that divine justice, once enacted, cannot be overturned or appealed.

2. Cosmic Order
• Angels are portrayed as having forsaken assigned “boundaries.” The ensuing punishment highlights that God’s eternal government extends over both physical and spiritual realms.

3. Pastoral Warning
• Jude writes to fortify believers against false teachers. The lasting chains of the angels serve as a sober reminder that defection from God’s order invites irrevocable consequences.

Distinction from Aionios

Another Greek adjective, usually rendered “eternal,” appears far more often (for example, John 3:16; 2 Corinthians 4:18). That common term can stress quality or duration depending on context. By contrast, the rarer word discussed here consistently points to duration without end, whether blessing (Romans 1:20) or judgment (Jude 1:6). The Spirit guided the New Testament authors to select this less-common term when they wished to eliminate any ambiguity about permanence.

Historical and Intertestamental Background

1. Jewish Literature
• Second Temple writings frequently describe divine attributes as “without beginning or end.” The New Testament echoes and heightens that motif by applying an unqualified term for permanence to God’s power.
2. Greco-Roman Thought
• Stoic and Platonic schools speculated about an eternal principle behind the cosmos. Paul reframes that philosophical instinct, locating timeless power not in an abstract force but in the personal God revealed in Scripture.

Doctrinal Significance

• Divine Self-Existence—God possesses underived life, unlike the created order.
• Immutable Judgment—Once God renders final sentence, the outcome endures forever.
• Moral Accountability—Humanity cannot plead ignorance, for creation itself testifies to an eternal, righteous Maker.

Ministry Applications

1. Evangelism
Romans 1:20 equips believers to begin gospel conversations with the witness of creation, moving from the universe’s design to the Designer’s unending power.
2. Discipleship
• A right view of God’s eternality fosters perseverance; believers trust that His purposes outlast shifting cultural moments.
3. Counseling
• When confronting habitual sin or spiritual apathy, Jude 1:6 sobers the heart, reminding counselees of the finality of divine judgment and the security found only in Christ.
4. Worship and Liturgy
• Hymns and prayers that celebrate “the everlasting God” echo Romans 1:20, aligning corporate praise with the apostolic testimony to God’s timeless majesty.

Summary of Insights

Though appearing only twice, this adjective gathers the great biblical poles of hope and warning. In Romans it magnifies the eternality of God’s power that invites faith and awe; in Jude it underscores the unending consequence of rebellion that calls for reverent obedience. Both uses converge to unveil a God whose purposes, whether in grace or in judgment, endure forever.

Forms and Transliterations
αιδιοις αϊδίοις ἀϊδίοις αιδιος αϊδιος ἀΐδιος αιδοία aidiois aïdíois aidios aḯdios
Links
Interlinear GreekInterlinear HebrewStrong's NumbersEnglishman's Greek ConcordanceEnglishman's Hebrew ConcordanceParallel Texts
Englishman's Concordance
Romans 1:20 Adj-NMS
GRK: ἥ τε ἀΐδιος αὐτοῦ δύναμις
NAS: His invisible attributes, His eternal power
KJV: [even] his eternal power and
INT: the both eternal of him power

Jude 1:6 Adj-DMP
GRK: ἡμέρας δεσμοῖς ἀϊδίοις ὑπὸ ζόφον
NAS: He has kept in eternal bonds
KJV: he hath reserved in everlasting chains
INT: day in chains eternal under darkness

Strong's Greek 126
2 Occurrences


ἀϊδίοις — 1 Occ.
ἀΐδιος — 1 Occ.

125
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