ein
*e. für allemal (endgültig, für immer): das lass dir e. für allemal gesagt sein
Duden


once and for all
completely and in a way that will finally solve a problem
Our intention is to destroy their offensive capability once and for all.
http://dictionary.cambridge.org/dictionary/br...

for good (British, American & Australian informal) also for good and all (American informal)
forever
I'm leaving for good this time.
Cambridge Idioms Dictionary, 2nd ed.
http://idioms.thefreedictionary.com/for+good+...

'For good and all' needs marking as AE. On the German side the spelling 'allemal' seems to be the preferred one.

neue Rechtschreibung:
allemal = (ugs.) natürlich, in jedem Fall (of course, certainly
ein für alle Mal(e) = once and for all, for good (and all) esp. AE

once and for all
(or once for all)
now and for the last time; finally.
http://oxforddictionaries.com/definition/engl...

Jude 1:3
Beloved, while I was giving all diligence to write unto you of our common salvation, I was constrained to write unto you exhorting you to contend earnestly for the faith which was once for all delivered unto the saints. (American Standard)

Dear friends, although I was very eager to write to you about the salvation we share, I felt compelled to write and urge you to contend for the faith that was once for all entrusted to God’s holy people. (NIV)

Liebe Freunde! Eigentlich wollte ich euch über die Rettung schreiben, die Gott uns gemeinsam geschenkt hat. Das liegt mir sehr am Herzen. Doch nun muss ich in meinem Brief ermahnen und warnen. Setzt euch entschlossen für den Glauben ein, wie er denen, die zu Gott gehören, ein für alle Mal überliefert ist. (Hoffunung für Alle)

Geliebte, da es mir ein großes Anliegen ist, euch von dem gemeinsamen Heil zu schreiben, hielt ich es für notwendig, euch mit der Ermahnung zu schreiben, dass ihr für den Glauben kämpft, der den Heiligen ein für alle Mal überliefert worden ist. (Schlachter 2000)

See also:
Romans 6:10; Hebrews 7:27; 9:12; 10: 10 (English: NIV; German: Schlachter 2000)


Stong's Concordance:
ephapax: once for all
Original Word: ἐφάπαξ
Part of Speech: Adverb
Transliteration: ephapax
Phonetic Spelling: (ef-ap'-ax)
Short Definition: once, once for all
Definition: once, once for all; at once.
http://concordances.org/greek/2178.htm

EASTER DEVOTIONAL
Once for All!
By Missey Butler
... Hallelujah…the debt had been paid….once for all!
http://www.cbn.com/spirituallife/Devotions/Bu...

Free from the law, O happy condition,
Jesus has bled and there is remission,
Cursed by the law and bruised by the fall,
Grace hath redeemed us once for all.

Refrain

Once for all, O sinner, receive it,
Once for all, O brother, believe it;
Cling to the cross, the burden will fall,
Christ hath redeemed us once for all.

Now we are free, there’s no condemnation,
Jesus provides a perfect salvation.
“Come unto Me,” O hear His sweet call,
Come, and He saves us once for all.

Refrain

“Children of God,” O glorious calling,
Surely His grace will keep us from falling;
Passing from death to life at His call;
Blessèd salvation once for all.

Refrain

Words and Music by Philip P. Bliss

When Developers Can Build Once For All Devices, Users Win
http://www.readwriteweb.com/archives/when_dev...

I wold like to see "once for all" added on the English side.