subadditive en · ADJ
Etymology
From sub- + additive.
Meanings
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(not-comparable, of a function) Such that the image of a sum is at most the sum of the images of the summands.
The square-root function is subadditive under addition because #92;sqrt#123;a#43;b#125;#92;le#92;sqrta#43;#92;sqrtb.