Decorum
来自Big Physics
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mid 16th century (as a literary term, denoting suitability of style): from Latin, neuter of the adjective decorus ‘seemly’.
wiktionary
From Latin decōrum, neuter form of decōrus(“proper, decent”).
etymonline
decorum (n.)
1560s, "that which is proper or fitting in a literary or artistic composition;" 1580s, "propriety of speech, behavior, or dress; formal politeness," from Latin decorum "that which is seemly," noun use of neuter of adjective decorus "fit, proper," from decor"beauty, elegance, charm, grace, ornament," from decus (genitive decoris) "an ornament," from PIE root *dek- "to take, accept" (on the notion of "to add grace").
