вѣчьнъ

From вѣкъ (věkŭ) +‎ -ьнъ (-ĭnŭ), Proto-Slavic *věčьnъ.

вѣчьнъ • (věčĭnŭ)

1. eternal
   • “ⰲⱑⱍⱐⱀⱏⰹ”, in Kiev Missal‎ (in Old Church Slavonic), 915±35?, page (leaf) 3, line 17:

     Ⱂⱃⱁⱄⰹⰿⱏ ⱅⱗ ⰲⱐⱄⰵⰿⱁⰳⱏⰹ^ ⰲⱑⱍⱐⱀⱏⰹ^ ⰱⰶ҃ⰵ · ⱂⱃⰹⰸⱐⱃⰹ ⱀⰰ ⰿⱁⰾⰹⱅⰲⱘ ⱀⰰⱎⱘ

     Prosimŭ tję vĭsemogy^ věčĭny^ bž:e · prizĭri na molitvǫ našǫ

     We beg you, almighty eternal God, look on our prayer

   • from Vita Constantini, 1800700-1800720:

     и ꙗкоже приближꙇи чась, да пакꙑ приметь и прѣставить се въ вѣчнаа жилища

     i jakože približii časĭ, da paky primetĭ i prěstavitĭ se vŭ věčnaa žilišta

     And when the hour to repose and remove to the eternal dwellings approached

2. age-old, existing since always
3. permanent, lasting, perpetual, existing until always
   • “ⰲⱑⱍⱐⱀⱘⱙ (leaf 64, line 2)”, in Codex Zographensis [Глаг. 1]‎ (in Old Church Slavonic), National Library of Russia, 1000±33, page Mt:25:46:

     ꙇдѫтъ си въ мѫкѫ вѣчьнѫѭ

     idǫtŭ si vŭ mǫkǫ věčĭnǫjǫ

     these go to everlasting torment