Made weaker or thinner by adding more liquid to something, or made less strong or effective in general.
From Latin 'dilutus,' past participle of 'diluere,' meaning 'to wash away' or 'to dissolve.' The word entered English in the 1500s and has been used both literally (for mixing liquids) and figuratively (for weakening effects or arguments).
In chemistry and marketing, 'diluted' is fascinating because it shows how context matters—a diluted cleaning product might be safer for kids, but a diluted philosophy loses its punch, so the same process can be good or bad depending on what you're diluting!
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