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Latin word negotium comes from Latin nec, Latin otium
nec (Latin)
And not. Nor. Not either. Not even And not, not. Neither. Nor. Not even.
otium (Latin)
Peace, quiet. Time avoiding activity: idleness, inactivity. Time free from activity: leisure.
negotium (Latin)
(figuratively) difficulty, pains, trouble, labor. (figuratively) matter, thing (= πρᾶγμα). Business, employment, occupation, affair.