| C&I | Checkout and Integration 
| Others |
| C&I | Commercial & Industrial
| Others |
| C&I | Compatibility and Interoperability
| Others |
| C&I | Control and Instrument
| Others |
| C/I | Check-In
| Others |
| C/I | Clinical Indicators
| Others |
| C/I | Cost and Insurance
| Others |
| CI | Cabin Interphone
| Others |
| CI | Cadence International
| Others |
| CI | Caloric Intake
| Others |
| CI | Cambria and Indiana Railroad
| Others |
| CI | Cambria and Indiana Railroad Company
| Others |
| CI | Can I?
| Others |
| CI | Canadian Institute, the
| Others |
| CI | Canopy Interception
| Others |
| CI | Capital Improvements
| Others |
| CI | Capitol Ice
| Others |
| CI | Cardiac Index
| Others |
| CI | Cardiac Insufficiency
| Others |
| CI | Cardio Interactive
| Others |
| CI | Career Increment
| Others |
| CI | Carnage, Inc.
| Others |
| CI | Carolyn Ianncelli
| Others |
| CI | Case Insensitive
| Others |
| CI | Cast Iron
| Others |
| CI | Cation Independent
| Others |
| CI | Causal Inference
| Others |
| CI | Cayley Isomorphism
| Others |
| CI | Cebrowski Institute
| Others |
| CI | Cell Inhibition
| Others |
| CI | Cellular Immunity
| Others |
| CI | Central Idea
| Others |
| CI | Central Information
| Others |
| CI | Cephalic Index
| Others |
| CI | Cerebral Infarct
| Others |
| CI | Cerebral Infarction
| Others |
| CI | Cerebral Ischaemia
| Others |
| CI | Cerebrovascular Insufficiency
| Others |
| CI | Certificate of Indebtedness
| Others |
| CI | Certification Inspection
| Others |
| CI | Certified Instructor
| Others |
| CI | Cervical Incompetence
| Others |
| CI | Chadwick International
| Others |
| CI | Chain Initiation
| Others |
| CI | Channel I
| Others |
| CI | Channel Islands
| Others |
| CI | CHARM Interface
| Others |
| CI | Chazon Ish
| Others |
| CI | Check In
| Others |
| CI | Checking In
| Others |
| CI | Chest Infection
| Others |
| CI | Children, Inc.
| Others |
| CI | Chounelleca Initiative
| Others |
| CI | Chronic Infection
| Others |
| CI | Chronic Inflammation
| Others |
| CI | Church of Ireland
| Others |
| CI | CI is
| Others |
| CI | cimetidine
| Others |
| CI | Cinch
| Others |
| CI | Cincinnati Field Office
| Others |
| CI | ciprofloxacin
| Others |
| CI | Circle Inspector
| Others |
| CI | Circulatory Insufficiency
| Others |
| CI | Civilian Internee
| Others |
| CI | Claims Inspector
| Others |
| CI | Claims Investigator
| Others |
| CI | Classical Incremental
| Others |
| CI | Classified Information
| Others |
| CI | Clinical Impression
| Others |
| CI | Clinical Improvement
| Others |
| CI | Clinical Index
| Others |
| CI | Clinical Indicator
| Others |
| CI | Clinical Instructor
| Others |
| CI | Clinical Investigator
| Others |
| CI | Clutch It
| Others |
| CI | Co Investigator
| Others |
| CI | Coagulation Index
| Others |
| CI | Cochlear Implant
| Others |
| CI | Code Inspector
| Others |
| CI | Code Interval
| Others |
| CI | Code Item
| Others |
| CI | Cognitive Impairment
| Others |
| CI | Coitus Interruptus
| Others |
| CI | Cold Ischaemia
| Others |
| CI | Colegio de Ingenieros de Chile
| Others |
| CI | Collective Index
| Others |
| CI | College of Engineers of Chile
| Others |
| CI | Color Index
| Others |
| CI | Color Intensity
| Others |
| CI | Color Interior film
| Others |
| CI | Colour Index
| Others |
| CI | Combat Identification
| Others |
| CI | Combustion Institute
| Others |
| CI | Command Information
| Others |
| CI | Command Interpreter
| Others |
| CI | Commercial Import
| Others |
| CI | Commercial Interior
| Others |
| CI | Commercial Investment
| Others |
| CI | Commercial Invoice
| Others |
| CI | Common Interface
| Others |
| CI | Communications and Information
| Others |
| CI | Communications Integrator
| Others |
| CI | Communist Index
| Others |
| CI | Compassion International
| Others |
| CI | Competitive Intelligence
| Business |
| CI | Completion Inspection
| Others |
| CI | Complex Interchange
| Others |
| CI | Component Inspector
| Others |
| CI | Component Instance
| Others |
| CI | Composite Index
| Others |
| CI | Compound Interest
| Others |
| CI | Comprehensive Integration
| Others |
| CI | Compression Ignition
| Others |
| CI | Computer Instructor
| Others |
| CI | Computer Interconnect
| Others |
| CI | Conditioned Inhibition
| Others |
| CI | Confidence Interval
| Others |
| CI | Confidence Intervals
| Others |
| CI | Confident Informants
| Others |
| CI | Confidential Informant
| Others |
| CI | Confidential Intermediary
| Others |
| CI | Configuration Inspection
| Others |
| CI | Configuration Interaction
| Others |
| CI | Configuration Item
| Others |
| CI | Congestion Indication
| Others |
| CI | Connected Intelligence
| Others |
| CI | Conservation International
| Others |
| CI | Constant Injection
| Others |
| CI | Constant Intensity
| Others |
| CI | Constant Interpolation
| Others |
| CI | Construction Index
| Others |
| CI | Construction Institute
| Others |
| CI | Contact Information
| Others |
| CI | Contact Investigation
| Others |
| CI | Content Integration
| Others |
| CI | Context Independent
| Others |
| CI | Contextualized Information
| Others |
| CI | Continued Insomnia
| Others |
| CI | Continuous Imaging
| Others |
| CI | Continuous Improvement
| Others |
| CI | Continuous Infusion
| Others |
| CI | Continuous Integration
| Software |
| CI | Continuous Interlock
| Others |
| CI | Continuous Irradiation
| Others |
| CI | Contra Indications
| Others |
| CI | Control Interval
| Others |
| CI | Controlled Indexing
| Others |
| CI | Controlled Intake
| Others |
| CI | Convective Instability
| Others |
| CI | Coordinating Installation
| Others |
| CI | Copper Insert
| Others |
| CI | Cordage Institute
| Others |
| CI | Coronary Insufficiency
| Others |
| CI | Corporate Identity
| Others |
| CI | Correspondence Information
| Others |
| CI | Corrosion Inhibitor
| Others |
| CI | Cortical Inhibition
| Others |
| CI | Cost Index
| Others |
| CI | Cost Innovation
| Others |
| CI | Cote D'Ivoire (Ivory Coast
| Others |
| CI | Cote d'Ivoire (Ivory Coast)
| Others |
| CI | Counter Insurgency
| Military |
| CI | Counter-Intelligence
| Others |
| CI | Coupe Ic
| Others |
| CI | Coupon Income
| Others |
| CI | Course Invalid
| Others |
| CI | Cranial Irradiation
| Others |
| CI | Creatinine Index
| Others |
| CI | Creative Innovations
| Others |
| CI | Crew Interface
| Others |
| CI | Cricket Ireland
| Cricket |
| CI | Criminal Intent
| Others |
| CI | Criminal Investigation
| Others |
| CI | Criminal Investigator
| Others |
| CI | Critical Infrastructure
| Others |
| CI | Crowd Involvement
| Others |
| CI | Crush Injury
| Others |
| CI | Crystal Irwin
| Others |
| CI | Crystalline Insulin
| Others |
| CI | Cubic Inch
| Others |
| CI | Cubic Inches
| Others |
| CI | Cultural Identity
| Others |
| CI | Cumulative Interest
| Others |
| CI | Curriculum And Instruction
| Others |
| CI | Custom Indicator
| Others |
| CI | Customer Installation
| Others |
| CI | Cybernetic Intelligence
| Others |
| CI | Cycle Indicator
| Others |
| CI | Cytoplasmic Inclusion
| Others |
| CI | Cytotoxicity Index
| Others |
| CI | Ivory Coast
| Others |
| CI | The Current Integrator
| Others |