This is the 3551st most frequent German word.
maas
"Maas" is not a standard German word but may refer to the river "Meuse" (Maas in German) that flows through Western Europe.
In this sentence, 'Maß' refers to an amount or quantity, in this case, the suitable measure of water.
Das Glas war bis zur Hälfte mit Wasser gefüllt, genau das richtige Maß.
The glass was filled halfway with water, exactly the right measure.
Here, 'Maß' is used to indicate a degree or extent of a quality, specifically patience in this instance.
Er zeigte ein unglaubliches Maß an Geduld.
He demonstrated an incredible degree of patience.
In this context, 'Maß' is used metaphorically to indicate a standard or guide to compare or assess matters.