ギリシャ語の dog-ma および syste-ma の M も被動・完了の相（過去分詞のごとき）を表わしている。
dokeo:考える " to think, suppose, expect. imagine "
c.1600 (in plural dogmata), from L. dogma "philosophical tenet,"
from Gk. dogma (gen. dogmatos) "opinion, tenet,"
lit. "that which one thinks is true,"
from dokein "to seem good, think" (see decent).
Treated in 17c.-18c. as a Greek word in English.
1610s, "the whole creation, the universe,"
from L.L. systema "an arrangement, system,"
from Gk. systema "organized whole, body,"
from syn- "together" + root of histanai "cause to stand"
from PIE root *sta- "to stand" (see stet).
Meaning "set of correlated principles, facts, ideas, etc." first recorded 1630s. Meaning "animal body as an organized whole, sum of the vital processes in an organism" is recorded from 1680s; hence figurative phrase to get (something) out of one's system (1900). Computer sense of "group of related programs" is recorded from 1963. All systems go (1962) is from U.S. space program.