What's a terminology to replace 'master' in the case of a 'master list'. I've used 'primary' and 'main', but they both imply the existence of a secondary or ot

What's a terminology to replace 'master' in the case of a 'master list'. I've used 'primary' and 'main', but they both imply the existence of a secondary or other acceptable replacement, which is rarely the case. "Single source of truth" is too cumbersome and often the incorrect context. 'Prime' looks like the best candidate going by synonyms. 'Authoritative' has too many syllables, although gets the point across. Blacklist and whitelist, when looking at the etymology these terms are obviously problematic, and I happily use block/ban list and allow list. Easy. Even "Green list" and "Red list" would work fine, traffic lights won't mind. Sanity check, never thought about that one. "Sense check" may have similar connotations, but the word sense, itself, has multiple meanings, so that's got a backdoor. Congruity check? I don't want to have to explain the word every time I ask for someone to "congruity check" a set of data.