Definition of Ic

Modern scholars write this word iċ, to mark that the c is pronounced like ch in church .

The whole word would probably have sounded something like Modern English each.

• The Modern English adjectival suffix -ic was first seen as a suffix in English during the Middle English period. It was borrowed in words from Old French '-ique', which came from Latin '-icus', which came ultimately from Ancient Greek '-ικος (-ikos)'. There are some that contend that '-icus' was native to Latin and was cognate with rather than borrowed from Greek. At any rate, the suffix -icus was very wide-spread by the Classical Latin period in native words as well as in words derived from Greek.
• It is also used in chemistry to denote certain chemical compounds in which a specified chemical element has a higher oxidation number than in the equivalent compound whose name ends in the suffix -ous. See Inorganic nomenclature.

As a word, ic was an Old English pronoun.

Also IC or ic may stand for:

• Integrated Circuit
• The rare short version of the Roman numeral XCIX.
• A Christogram
• IC - interchangeable core or interchangeable core lock cylinder
• Ic* - Icarusce
• -ic suffix
• In chatting terms, it stands for "I See". Also see Internet Slang
• IC brand school buses. See Navistar International.
• IC codes, police shorthand expressions
• Ice Climber
• Ice Crystals (METAR Code)
• iCommune
• Identity card
• Illinois Central Railroad 
• Incident Commander
• Index Catalogue
• International College, Beirut
• Intercontinental Championship, WWE
• Imagine Cup, the "world's largest student technology competition", a contest organized by Microsoft and sponsored by organizations like BT, HP, Intel, Kaspersky Lab, Wiley, Lexar, and the Korean Ministry of Education & HR Development
• Immediate constituent (IC), in morphology
• Imperial College London - The famous science university is often referred to simply as 'IC'
• Impossible Creatures, a real-time strategy game
• In Casu, Latin for 'in this case'
• In Character - as opposed to OOC (Out of Character) in Roleplaying
• In mathematics, the axiom assuming the existence of an inaccessible cardinal.
• Index Catalog
• Index of coincidence
• The IATA airline designator for Indian Airlines
• Industry Canada - a division of the Government of Canada
• Informed consent in clinical trial the form that has to be signed by the patient (subject) before entering the study.
• Institute of Computing
• Intellectual capital
• In Command a Canadian Album
• Intelligence Community, a federation of agencies and organizations conducting intelligent activities (United States).
• Intensive Care, also for Intensive Care Unit (ICU)
• Intentional Community
• Interactive C, a programming language for robotic controllers
• InterCity in railway travel
• InterContinental hotel chain, or its parent company InterContinental Hotels Group
• Internal combustion engine
• International Canoe in Canoe sailing
• "International Coordinator", the top coordinator of the FidoNet
• Interstitial cystitis, a disease
• Instruction Count, in computer science
• Introductory Calculus
• Ion chromatography 
• Iowa City, Iowa, USA
• Ithaca College
• Imagine China