Etymology
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dietary (adj.)

"pertaining to diet," 1610s, from Medieval Latin dietarius, from Latin diaetarius, from diaeta "prescribed way of life" (see diet (n.1)).

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Definitions of dietary
1
dietary (n.)
a regulated daily food allowance;
2
dietary (adj.)
of or relating to the diet;
dietary restrictions
Synonyms: dietetic / dietetical
From wordnet.princeton.edu