ISO 5725: Etroitesse de l'accord entre le résultat et la valeur de référence acceptée.

ICH: The closeness of agreement between the value which is accepted either as a conventional true value or an accepted reference value and the value found

MSA: "Closeness" to the true value, or to an accepted reference value

Minitab: Accounts for the number of predictors in your model and is useful for comparing models with different numbers of predictors.

ISO 3534: The alternative hypothesis is a statement which contradicts the null hypothesis. The corresponding test statistic is used to decide between the null and alternative hypothesist.