Словарь синонимов английского языка - authoritative

(adj) 1. official, valid, authentic, documented, certified, validated, legitimate, sanctioned; conclusive: The second edition is usually considered the authoritative one. 2. scholarly, learned, authentic, valid, sound, veritable, verifiable, accurate, factual, faithful, dependable, reliable, trustworthy, true, truthful: There is no more authoritative source than Professor Fitzhugh on early Egypdian history.