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adverb

Greekἐφάπαξ (efapax)
Biblang

efapax

Strong’sG2178

once, once for all

stem efapax-5 times in the New Testamentin 3 of 27 booksnever changes form

What it means

What the word means, in the words of the lexicons out of copyright — Abbott-Smith, Strong's, and Liddell-Scott-Jones, wherever each has an entry for it.

* ἐφ-άπαξ,

adv.
1. once for all (Eupol.): Ro 6:10 He 7:27 9:12 10:10.
2. at once: I Co 15:6.†

G. Abbott-Smith, A Manual Greek Lexicon of the New Testament, 1922 — public domain. References open in the reader.

Strong’s G2178 — the 1890 definition, and where the word comes from

Saidef-ap'-ax

upon one occasion (only)

Fromfrom G1909 and G530;

King James(at) once (for all).

James Strong, Exhaustive Concordance of the Bible, 1890 — public domain. The numbers in it link to the entries here.

Liddell-Scott-Jones — the classical dictionary this word appears in
ἐφάπαξ [ᾰπ],
adverb once for all, NT+5th c.BC+
II at once, NT

H. G. Liddell, R. Scott, H. S. Jones, A Greek-English Lexicon (9th ed., 1925–1940) — digitised by the Perseus Digital Library and corrected and expanded by Tyndale House, Cambridge, via STEPBible-Data's TFLSJ table, CC BY 4.0. Covers all of Greek literature, not just the Bible.

Translated as

Every occurrence, sorted by the English it was actually given — the evidence for what the word means, not a gloss of it.

once for all4×at one time1×

Berean Standard Bible (BSB), dedicated to the public domain — berean.bible.

Where it appears

Every verse the word appears in, filed under the form it takes there.

5 occurrences, every one of them listed

efapax5×

Romans 6:10hem gar apothnēskata, ta hamarta apothnēskata efapax; hem de zōatō, zōatō to theo.… He died, He died to sin once for all; but the life He lives, He …

1 Corinthians 15:6“at one time”epeita horita epanō pentakosioi adelfoi efapax, ek hoiu tois polloterois menalō heōs …… that, He appeared to more than five hundred brothers at once, most of whom are still …

Hebrews 7:27… taiu tou laou houtem gar poiata efapax heauton anaferarantos;… the people; He sacrificed for sin once for all when He offered up Himself.

Hebrews 9:12… dia de teu idieu haimeu, eiserchata efapax eis teim hagieim, aiōnian lutrōsian heuriskerantos.… He entered the Most Holy Place once for all by His own blood, thus securing …

Hebrews 10:10… tau prosforau teu sōmeu Iēsu Christou efapax.… of the body of Jesus Christ once for all.