A und O

From Ancient Greek. From the biblical book of Revelation, verses 1:8 and 22:13. The expression refers to God as “the beginning and the end”, the letter omega being the last of the Greek alphabet.

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A und O n (strong, genitive A und O, no plural)

1. (colloquial) that which is important; that which matters; a sine qua non

   Gute Kohle ist das A und O beim Grillen.

   Good charcoal is the most important part of barbecuing.

2. (biblical, possibly dated) alpha and omega

• The biblical expression is not usually translated with these words now. For example, in the Einheitsübersetzung verse 22:13 runs: “Ich bin das Alpha und das Omega, der Erste und der Letzte, der Anfang und das Ende.”