The Collaborative International Dictionary of English v.0.48:

Il- \Il-\
   A form of the prefix in-, not, and in-, among. See In-.
   [1913 Webster]

WordNet (r) 3.0 (2006):

il
    adj 1: being nine more than forty [syn: forty-nine, 49,
           il]
    n 1: a midwestern state in north-central United States [syn:
         Illinois, Prairie State, Land of Lincoln, IL]

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

IL
       Instruction List


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

il

    The country code for Israel.

   (1999-01-27)