What does diluted mean?
Diluted describes something that has been made weaker, thinner, or less concentrated — most literally by mixing it with water or another solvent, as when concentrated fruit juice is diluted before drinking. The word extends naturally into figurative use, where it characterises anything that has lost strength, clarity, or value through being spread too thin: a diluted argument, a diluted brand identity, or a shareholder's diluted stake after new shares are issued. This dual life gives the word unusual range across everyday, scientific, business, and critical writing. Its connotations lean mildly negative outside the laboratory, since calling something diluted suggests that its original potency has been compromised, whether deliberately or through carelessness. Rooted in Latin lavare, 'to wash', it carries a long history stretching back to Roman practices of watering down wine, making it both a precise technical term and an enduring metaphor for anything softened or diminished.
Past tense and past participle of 'dilute': made (a liquid) less concentrated by adding water or another solvent; weakened the strength or effect of something.
"She diluted the bleach carefully before using it on the tiles."
This is the dominant form in scientific and medical writing.
Reduced in concentration or strength; figuratively, weakened in force, quality, or distinctiveness.
"The sauce tasted bland and overly diluted."
As an adjective, often used attributively before a noun ('a diluted solution') or predicatively ('the mixture is diluted').
Every glass of squash, every vaccine vial, and every compromise in a negotiation involves dilution — the ancient Romans were already thinning their wine with water and calling it out by name.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of diluted
'Diluted' comes from the Latin verb diluere, formed from dis- ('apart') plus lavere ('to wash'), originally meaning to wash away or dissolve. The English verb 'dilute' was borrowed from the past participle dilutus, entering the language in the mid-16th century. It shares this watery root with words like 'lavish', 'lava', and 'deluge', all ultimately tracing back to the same Indo-European base meaning to wash. The adjective sense developed directly from the verb's past participle, and figurative uses soon followed.
Related word forms
How diluted is actually used
Mostly neutral to slightly negative in tone: describing an argument or product as 'diluted' often implies it has lost something valuable. In chemistry and medicine it is purely technical. The verb form ('the solution was diluted') is more common in scientific writing than the adjective.
Easily confused with diluted
'Diluted' means made weaker or less concentrated, while 'deluded' means deceived into believing something false.