Metage refers to the act of measuring or weighing goods for commercial purposes. However, there are several antonyms for this term that refer to measuring things in other contexts. One such antonym is "estimation", which implies the process of approximating the value or size of an object using judgment or guesswork. Another antonym is "guesswork", which may refer to the act of making judgments or predictions without any evidence or data. Other antonyms for metage include "vagueness", "uncertainty", and "inexactness", which all describe a lack of precision or accuracy in measuring or determining the value of something.