Muss

• Muß (superseded)

Substantivization of muss (“must”), third-person singular present indicative of müssen (“to have to”).

• IPA^(key): /mʊs/

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• Rhymes: -ʊs

Muss n (strong, genitive Muss, no plural)

1. necessity, a must

   Synonym: Notwendigkeit

• The spelling Muss has been the prescribed spelling since the German spelling reform of 1996 (the Rechtschreibreform). In Switzerland and Liechtenstein, it had already been standard since ⟨ß⟩ was deprecated in the 1930s. In the affected areas, the previous spelling (Muß) is now less common, and may be regarded as a misspelling.

• “Muss” in Duden online
• “Muss” in Digitales Wörterbuch der deutschen Sprache

From the past tense of Middle Low German môten, from Old Saxon mōtan.

Muss m

1. a need, a necessity, a must