Plural of dilution; the act of diluting something, or a solution made by mixing a substance with a diluent to reduce its concentration.
From 'dilution,' which comes from Latin 'dilutio' (a dissolving, washing away). The plural '-s' is regular English morphology applied to this Latin-derived noun.
In chemistry, creating the right 'dilutions' is an art—from serial dilutions in microbiology to the famous homeopathic dilutions that dilute substances so much they technically contain nothing, the word means very different things to different fields.
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