Proper noun

1. A female given name, a diminutive of Catherine or any of its variant spellings.
   • 1892 Walter Malone, Narcissus: and Other Poems, J.B.Lippincott Company 1892, page 133 ("Mary"):

     And "Mable" 'sa name that ever sounds sweetly / And charms and enchants a mortal completely / While "Katie" suggests brown eyes and brown tresses / Created for love and lover's caresses.

2. The Missouri, Kansas and Texas (M.K.T) Railroad.

   When the Katie came through, the town's entire economy and culture changed.

3. A king and a ten as a starting hand in Texas hold 'em due to phonetic similarity with "K-T"