From Late Middle English whilst, whilest, qwhilste (Northern England), quilest (Northwest Midlands) [and other forms], from whiles + -t.

• Western Frisian wylst

• (RP, America) IPA: /waɪlst/
• (non-wine-whine) IPA: /ʍaɪlst/
• (chiefly, America, British, sometimes, proscribed) IPA: /wɪlst/

whilst (not comparable)

1. (archaic or obsolete, except, dialectal) Often preceded by the: During the time; meanwhile.
   • c. 1601–1602 (date written), William Shakespeare, “Twelfe Night, or What You Will”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC ↗, [Act IV, scene ii], page 270 ↗, column 2:

     Nay, I prethee put on this gown, & this beard, make him beleeue thou art ſir Topas the Curate, doe it quickly. Ile call ſir Toby the whilſt.

   • c. 1607–1611 (first performance), Franc[is] Beaumont, Jo[hn] Fletcher, Cupids Revenge. […], 3rd edition, London: […] A[ugustine] M[atthews], published 1635, →OCLC ↗, Act II, scene [v] ↗:

     Hero. Leave, leave, tis novv too late. She is dead, her laſt is breathed. / Cleo[phila]. VVhat ſhall vvee doe. / Her[o]. Goe run, / And tell the Duke; and vvhilſt ile cloſe her eyes.

   • 1819 December 20 (indicated as 1820), Walter Scott, chapter X, in Ivanhoe; a Romance. […], volume I, Edinburgh: […] Archibald Constable and Co.; London: Hurst, Robinson, and Co. […], →OCLC ↗, page 209 ↗:

     What money have I bought with me? […] even but a small sum; something in hand the whilst.

     Erronously, this volume of the work has two chapters numbered X; this is the second one.

1. (Britain, Australia, literary or rare in North America) Synonym of while

   Synonyms: Thesaurus:while

   1. During the whole, or until the end, of the time that; as long as, at the same time.

      Synonyms: whiles

      Drivers must switch off engines whilst on stand.

      • c. 1596 (date written), William Shakespeare, “The Life and Death of King Iohn”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC ↗, [Act IV, scene ii], page 16 ↗, column 1:

        I ſaw a Smith ſtand with his hammer (thus) / The whilſt his Iron did on the Anuile coole.

      • c. 1597 (date written), William Shakespeare, “The Merry Wiues of Windsor”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC ↗, [Act I, scene i], page 40 ↗, column 2:

        […] Ile nere be drunk whilſt I liue againe, but in honeſt, ciuill, godly company for this tricke: if I be drunke, Ile be drunke with thoſe that haue the feare of God, and not with drunken knaues.

      • 1633 May 21 (licensing date; Gregorian calendar), John Fletcher, [James Shirley], The Night-Walker, or The Little Thief. A Comedy, […], London: […] Andrew Crook[e], published 1661, →OCLC ↗, Act I ↗:

        VVell, make your mirth, the whilſt I bear my miſery: / Honeſt minds vvould have better thoughts.

      • 1703, [Daniel Defoe], More Reformation. A Satyr upon Himself. […], [London: s.n.], →OCLC ↗, page 12 ↗:

        And thus with lame pretences they revive / Thoſe Lines when Dead, he bluſh'd at whilſt alive: / As if Mankind could not diſcern their Evil, / Without a naked Viſion of the Devil.

      • 1813 January 26, [Jane Austen], chapter V, in Pride and Prejudice: […], volume III, London: […] [George Sidney] for T[homas] Egerton, […], →OCLC ↗, page 92 ↗:

        Elizabeth, as she affectionately embraced her, whilst tears filled the eyes of both, lost not a moment in asking whether any thing had been heard of the fugitives.

   2. Within, or before the end, of the time that.
      • 1819, Jedediah Cleishbotham [pseudonym; Walter Scott], chapter VII, in Tales of My Landlord, Third Series. […], volume II (The Bride of Lammermoor), Edinburgh: […] [James Ballantyne and Co.] for Archibald Constable and Co.; London: Longman, Hurst, Rees, Orme, and Brown, […]; Hurst, Robinson, and Co. […], →OCLC ↗, page 172 ↗:

        [P]ray, step down to the cellar and fetch us a bottle of the Burgundy, 1678—it is the fourth bin from the right-hand turn—And I say, Craigie—you may fetch up half-a-dozen whilst you are about it—Egad, we'll make a night on't.

   3. Although; in contrast; whereas.
      • c. 1594 (date written), William Shakespeare, “The Comedie of Errors”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC ↗, [Act II, scene i], page 88 ↗, column 1:

        His company must do his minions grace, / Whil'ſt I at home ſtarue for a merrie looke: / Hath homelie age th'alluring beauty tooke / From my poore cheeke?

      • 1609, William Shakespeare, “Sonnet 37”, in Shake-speares Sonnets. […]‎, London: By G[eorge] Eld for T[homas] T[horpe] and are to be sold by William Aspley, →OCLC ↗:

        So then I am not lame, poore, nor diſpiſ'd, / VVhilſt that this ſhadow doth ſuch ſubſtance giue, / That I in thy abundance am ſuffic'd, / And by a part of all thy glory liue: […]

      • 1655, Thomas Fuller, “Section I. The First Century.”, in The Church-history of Britain; […], London: […] Iohn Williams […], →OCLC ↗, book, subsection 2 (Their Principal Idols), page 6 ↗:

        There is a place near St. Paul's in London, called in the old records "Diana's chamber," where, in the days of king Edward I. thousands of the heads of oxen were digged up; whereat the ignorant wondered, whilst the learned well understood them to be the proper sacrifices to Diana, whose great temple was built thereabout.

      • 1847 January – 1848 July, William Makepeace Thackeray, “Brussels”, in Vanity Fair […], London: Bradbury and Evans […], published 1848, →OCLC ↗, page 253 ↗:

        Whilst her appearance was an utter failure (as her husband felt with a sort of rage), Mrs. Rawdon Crawley's début was, on the contrary, very brilliant.

   4. Besides; in addition.
      • 1963, Margery Allingham, “The Boy in the Corner”, in The China Governess: A Mystery, London: Chatto & Windus, →OCLC ↗, page 214 ↗:

        The face which emerged was not reassuring. It was blunt and grey, the nose springing thick and flat from high on the frontal bone of the forehead, whilst his eyes were narrow slits of dark in a tight bandage of tissue.

   5. Only if; provided that; as long as.