Definition of "teen"

teen¹

/tiːn/

noun
plural teens
1. Synonym of teenager: a person between 13 and 19 years old.
adjective
not comparable
1. Of or having to do with teenagers; teenage

teen²

/tiːn/

noun
plural teens
1. (archaic) Grief; sorrow; trouble.
  Quotations
  In which the birds song many a lovely lay / Of Gods high praise, and of their loves sweet teene, / As it an earthly Paradize had beene […]
  1590, Edmund Spenser, “Book III, Canto V”, in The Faerie Queene. […], London: […] [John Wolfe] for William Ponsonbie
  The Soldan changed hue for grief and teen, / On that sad book his shame and loss he lear'd.
  1600, Edward Fairfax, The Jerusalem Delivered of Tasso, X, xxv
  Miranda: O my heart bleedes / To thinke oth' teene that I haue turn'd you to, / Which is from my remembrance, […]
  1610–1611 (date written), William Shakespeare, “The Tempest”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act I, scene ii], page 2
  Your soul forgot her joys, forgot / Her times of teen; / Yea, this life likewise will you not / Forget
  1866, Algernon Swinburne, Faustine
  With public toil and private teen Thou sank'st alone.
  1867, Matthew Arnold, A Southern Night
  That City's sombre Patroness and Queen, / In bronze sublimity she gazes forth / Over her Capital of teen and threne
  1874, James Thomson, The City of Dreadful Night, XXI
2. (archaic or obsolete) Vexation; anger; hate.

teen³

/tiːn/

verb
third-person singular simple present teens, present participle teening, simple past and past participle teened
1. (transitive, obsolete) To excite; to provoke; to vex; to afflict; to injure.
2. (reflexive, obsolete) To become angry or distressed.
  Quotations
  Þenne tened hym theologye · whan he þis tale herde
  c. 1385, William Langland, Piers Plowman, section II

teen⁴

/tiːn/

verb
third-person singular simple present teens, present participle teening, simple past and past participle teened
1. (transitive, obsolete or dialectal, Devon) To close, to shut; to enclose, to hedge or fence in.
  Quotations
  Hie tho' off […] or th' dur may be teen'd.
  1874 (1879), Waugh, Chim. Corner, 75
  It is still heard in Devon , especially by older dialect speakers, in such expressions as “I'an't a-teen'd my eyes all night”; “Teen the door, will ' e?”
  1919, Devonshire Association for the Advancement of Science, Literature and Art, Report and Transactions of the Devonshire Association for the Advancement of Science, Literature and Art, page 75
  She whimpered and whined about it till, in self-defence, I rose up and teened the candle and got into my breeches.
  1924, Eden Phillpotts, Redcliff, page 244