quod erat faciendum
Latin phrase
quod erat fa·ci·en·dum
| \ ˌkwȯd-ˈer-ˌät-ˌfä-kē-ˈen-ˌdu̇m
\
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Definition of quod erat faciendum
: which (is what) was to be done (originally)
—abbreviation q.e.f.
—used at the end of a geometrical construction