The Collaborative International Dictionary of English v.0.48:

Girl \Girl\ (g[~e]rl), n. [OE. girle, gerle, gurle, a girl (in
   sense 1): cf. LG. g["o]r child.]
   [1913 Webster]
   1. A young person of either sex; a child. [Obs.] --Chaucer.
      [1913 Webster]

   2. A female child, from birth to the age of puberty; a young
      maiden.
      [1913 Webster]

   3. A female servant; a maidservant. [U. S.]
      [1913 Webster]

   4. (Zool.) A roebuck two years old. [Prov. Eng.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

girl
    n 1: a young woman; "a young lady of 18" [syn: girl, miss,
         missy, young lady, young woman, fille]
    2: a youthful female person; "the baby was a girl"; "the girls
       were just learning to ride a tricycle" [syn: female child,
       girl, little girl] [ant: boy, male child]
    3: a female human offspring; "her daughter cared for her in her
       old age" [syn: daughter, girl] [ant: boy, son]
    4: a girl or young woman with whom a man is romantically
       involved; "his girlfriend kicked him out" [syn: girlfriend,
       girl, lady friend]
    5: a friendly informal reference to a grown woman; "Mrs. Smith
       was just one of the girls"

Moby Thesaurus II by Grady Ward, 1.0:

127 Moby Thesaurus words for "girl":
   Dulcinea, Eve, Frau, Fraulein, abigail, amah, au pair girl, ayah,
   babe, baby, best girl, betrothed, betweenmaid, biddy, bird, broad,
   chambermaid, chaperon, chick, colleen, companion, cook, crumpet,
   cutie, dame, damoiselle, damsel, daughter of Eve, deb, debutante,
   demoiselle, distaff, doll, domina, donna, dowager, dream girl,
   duenna, female, femme, femme de chambre, fiancee, fille de chambre,
   filly, frail, friend, frow, gal, gamine, gentlewoman, gill,
   girl friend, girlie, handmaid, handmaiden, heifer, hired girl,
   housemaid, hoyden, inamorata, jeune fille, jill, jo, junior miss,
   kitchenmaid, lady, lady friend, lady love, lady-help,
   lady-in-waiting, lass, lassie, little missy, live-in maid,
   live-out maid, lover, mademoiselle, maid, maiden, maidservant,
   matron, milady, miss, missy, mistress, moll, mouse, nursemaid,
   nymphet, old lady, parlormaid, piece, quail, quiff, romp,
   schoolgirl, schoolmaid, schoolmiss, scullery maid, servant girl,
   servitress, skirt, slip, soubrette, squaw, squeeze, subdeb,
   subdebutante, subteen, subteener, sweetheart, tally, teenybopper,
   tomato, tomboy, tweeny, twist, upstairs maid, virgin, vrouw,
   wahine, waiting maid, weaker vessel, wench, woman, young creature,
   young thing



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

GIRL
       Generalized Information Retrieval Language


The Free On-line Dictionary of Computing (30 December 2018):

GIRL

   Graph Information Retrieval Language.  A language for handling
   directed graphs.

   ["Graph Information Retrieval Language", S. Berkowitz, Report
   76-0085, Naval Ship Res Dev Center, (Feb 1976)].

   (1994-11-02)