From Middle English clene, clane, from Old English clǣne, from Proto-West Germanic *klainī, perhaps from Proto-Indo-European *glēy-, from Proto-Indo-European *gel-.

• (RP) IPA: /kliːn/, [kʰl̥iːn]
• (America) enPR: klēn, IPA: /klin/, [kʰl̥ĩn]
• (Ireland, dated) enPR: klān, IPA: /kleːn/, [kʰl̥eːn]

clean (comparative cleaner, superlative cleanest)

1. (physical) Free of dirt or impurities.
   1. Not dirty, filthy, or soiled.

      Are these dishes clean?
      Your room is finally clean!
      For a baby, happiness is a full bottle and a clean diaper.

      • 1913, Mrs. [Marie] Belloc Lowndes, chapter II, in The Lodger, London: Methuen, →OCLC ↗; republished in Novels of Mystery: The Lodger; The Story of Ivy; What Really Happened, New York, N.Y.: Longmans, Green and Co., […], [1933], →OCLC ↗:

        Then his sallow face brightened, for the hall had been carefully furnished, and was very clean. There was a neat hat-and-umbrella stand, and the stranger's weary feet fell soft on a good, serviceable dark-red drugget, which matched in colour the flock-paper on the walls.

   2. In an unmarked condition.

      Put a clean sheet of paper into the printer.

   3. (aerodynamics) Allowing an uninterrupted flow over surfaces, without protrusions such as racks or landing gear.
   4. (aviation) Having the undercarriage and flaps in the up position.

      Antonyms: dirty

   5. Empty.

      The cargo hold is clean.

      Mister, I want to see a clean dinner plate or there'll be no dessert for you.

   6. (of metal) Having relatively few impurities.

      clean steel

2. (behavioural) Free of immorality or criminality.
   1. Pure, especially morally or religiously.

      Our kids can watch this movie because it is clean.

      • 1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], →OCLC ↗, Psalms 51:10 ↗:

        Create in me a clean heart, O God.

      • 1833 (date written), Alfred Tennyson, “St. Simeon Stylites”, in Poems. […], volume II, London: Edward Moxon, […], published 1842, →OCLC ↗, page 63 ↗:

        Ah! let me knot be fool'd, sweet saints. I trust / That I am whole, and clean, and meet for Heaven.

   2. Not having used drugs or alcohol.

      I've been clean this time for eight months.

   3. (of criminal, driving, etc. records) Without restrictions or penalties, or someone having such a record.

      Unlike you, I’ve never caused any accidents — my record is still clean!

   4. (informal) Not in possession of weapons or contraband such as drugs.

      I'm clean, officer. You can go ahead and search me if you want.

   5. (informal) Devoid of profanity.
3. Smooth, exact, and performed well.

   I'll need a sharper knife to make clean cuts.

   a clean leap over a fence

4. (obsolete) Total; utter.
   • 1655, James Howell, “To the Right Honourable the Earl of Clare”, in Epistolæ Ho-Elianæ. Familiar Letters Domestic and Forren. […], 3rd edition, volume (please specify the page), London: […] Humphrey Mos[e]ley, […], →OCLC ↗:

     Moreover, I find there are some Words now in French which are turned to a Countersense […] Cocu is taken for one whose Wife is light, and hath made him a passive Cuckold; whereas clean contrary, Cocu, which is the Cuckow, doth use to lay her Eggs in another Bird's Nest.

5. (informal) Cool or neat.

   Wow, dude, those are some clean shoes ya got there!

6. (health, of a person) Free of infection or disease.
   1. (health) Devoid of sexually transmitted diseases (STDs).

      I want to make sure my fiancé is clean before we are married.

7. That does not damage the environment.

   clean energy

   clean coal

8. Free from that which is useless or injurious; without defects.

   clean land

   clean timber

9. Free from restraint or neglect; complete; entire.
   • 1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], →OCLC ↗, Leviticus 23:22 ↗:

     When ye reap the harvest of your land, thou shalt not make clean riddance of corners of thy field.

10. Well-proportioned; shapely.

    clean limbs

11. (climbing, of a route) Ascended without falling.
12. (professional wrestling slang) Of a victory or performance: without any submission holds, disqualification, interference, etc.

• (not dirty) Thesaurus:clean

• dirty
• unclean

• French: propre, net
• German: sauber, rein
• Italian: pulito
• Portuguese: limpo, asseado
• Russian: чи́стый
• Spanish: limpio

• Portuguese: limpo
• Russian: чи́стый

• French: pur
• German: rein
• Portuguese: puro, imaculado
• Russian: чи́стый
• Spanish: limpio

• French: clean
• German: clean
• Italian: pulito
• Portuguese: limpo
• Spanish: limpio

• German: sauber
• Portuguese: limpo
• Russian: чи́стый

• German: sauber

• Italian: pulito
• Russian: чи́стый

• French: clean

• Italian: pulito
• Russian: чи́стый

clean (plural cleans)

1. Removal of dirt.

   This place needs a clean.

2. (weightlifting) The first part of the event clean and jerk in which the weight is brought from the ground to the shoulders.
3. (in the plural, metal music) Clear vocals, contrasted with death growls and screams.

• Portuguese: limpeza, limpada

clean (cleans, present participle cleaning; simple past and past participle cleaned)

1. (transitive) To remove dirt from a place or object.

   Can you clean the windows today?

2. (transitive) To tidy up, make a place neat.

   Clean your room right now!

3. (transitive, climbing) To remove equipment from a climbing route after it was previously lead climbed.
4. (intransitive) To make things clean in general.

   She just likes to clean. That’s why I married her.

5. (transitive, computing) To remove unnecessary files, etc. from (a directory, etc.).
6. (intransitive, curling) To brush the ice lightly in front of a moving rock to remove any debris and ensure a correct line; less vigorous than a sweep.
7. (manga fandom) To purge a raw of any blemishes caused by the scanning process such as brown tinting and poor color contrast.
8. (video games) Synonym of clean up
9. To remove guts and/or scales of a butchered animal.

• See also Thesaurus:make clean

• French: nettoyer, poutzer (Switzerland)
• German: reinigen, säubern, putzen, abwischen
• Italian: pulire, nettare
• Portuguese: limpar
• Russian: чи́стить
• Spanish: limpiar

• French: ranger
• German: aufräumen, putzen
• Italian: ordinare
• Portuguese: arrumar
• Russian: убира́ть
• Spanish: arreglar

• French: nettoyer
• German: reinigen, säubern, putzen
• Portuguese: limpar

clean (comparative cleaner, superlative cleanest)

1. Fully and completely.

   He was stabbed clean through.

   You must be clean mad.

   • 1897, Richard Marsh, The Beetle:

     So, since all my pains in his direction were clean thrown away, there was nothing left for me but to scurry back to Marjorie, — so I scurried, and I found the house empty, no one there, and Marjorie gone.

   • 1963, Margery Allingham, chapter 1, in The China Governess: A Mystery, London: Chatto & Windus, →OCLC ↗:

     The huge square box, parquet-floored and high-ceilinged, had been arranged to display a suite of bedroom furniture designed and made in the halcyon days of the last quarter of the nineteenth century, when modish taste was just due to go clean out of fashion for the best part of the next hundred years.

• Russian: на́чисто

1. Surname.