An Etymological Dictionary of Astronomy and Astrophysics

1. A specific tenet or doctrine authoritatively laid down, as by a church.
   

2. An official system of principles or tenets concerning faith, morals, behavior, etc., as of a church.
   

3. Prescribed doctrine proclaimed as unquestionably true by a particular group (Dictionary.com).

Etymology (EN): L. dogma “philosophical tenet,” from Gk. dogma “opinion, tenet,” literally “that which one thinks is true,” from dokein “to seem good, think,” cognate with Pers. andišé “thought,” dis, → form.

Etymology (PE): Kiš “dogma, religion,” from Mid.Pers. kêš “religion, faith, dogma;” Av. tkaēša- “teaching,” kaeš-, kaš- “to teach;” PIE *k^weis- “to observe, see” (Cheung 2007).