Merriam-Webster Collegiate Dictionary - in

 abbreviation Indiana IN  symbol indium IN  I. noun suffix  Etymology: French ~e, from Latin -ina, feminine of -inus of or belonging to — more at -en  1.  a. neutral chemical compound insulin  b. enzyme pancreatin  c. antibiotic penicillin  2. ~e II,1a, b epinephrin  3. pharmaceutical product niacin  II. noun combining form  Etymology: sit-in organized public protest by means of or in favor of ; demonstration teach-in love-in IN  I. preposition  Etymology: Middle English, from Old English; ak~ to Old High German ~ ~, Lat~ ~, Greek en  Date: before 12th century  1.  a. — used as a function word to ~dicate ~clusion, location, or position with~ limits ~ the lake wounded ~ the leg ~ the summer  b. ~to 1 went ~ the house  2. — used as a function word to ~dicate means, medium, or ~strumentality written ~ pencil bound ~ leather  3.  a. — used as a function word to ~dicate limitation, qualification, or circumstance alike ~ some respects left ~ a hurry  b. ~to 2a broke ~ pieces  4. — used as a function word to ~dicate purpose said ~ reply  5. — used as a function word to ~dicate the larger member of a ratio one ~ six is eligible  II. adverb  Date: before 12th century  1.  a.  (1) to or toward the ~side especially of a house or other build~g come ~  (2) to or toward some dest~ation or particular place flew ~ on the first plane  (3) at close quarters ; near play close ~  b. so as to ~corporate mix ~ the flour — often used ~ comb~ation built-~ bookcases  c. to or at an appropriate place fit a piece ~  2.  a. with~ a particular place; especially with~ the customary place of residence or bus~ess the doctor is ~  b. ~ the position of participant, ~sider, or officeholder — often used with on ~ on the joke  c.  (1) on good terms  (2) ~ a specified relation ~ bad with the boss  (3) ~ a position of assured or def~itive success  d. ~ vogue or season  e. of an oil well ~ production  f. ~ one's presence, possession, or control after the crops are ~  g. from a condition of ~dist~guishability to one of clarity fade ~  III. adjective  Date: 1599  1.  a. that is located ~side or with~ the ~ part  b. that is ~ position, operation, or power the ~ party  c. ~side 2  2. that is directed or bound ~ward ; ~com~g the ~ tra~  3.  a. extremely fashionable the ~ th~g to do  b. keenly aware of and responsive to what is new and fashionable the ~ crowd  IV. noun  Date: 1764  1. one who is ~ office or power or on the ~side a matter of ~s versus outs  2. ~fluence, pull enjoyed some sort of ~ with the commandant — Henriette Roosenburg  V. abbreviation  1. ~ch  2. ~let