| Abbreviation | Definition |
|---|---|
| CORE | Community Organization Reciprocation and Education |
| CORE | Continuing Opportunities For Reading Excellence |
| CORE | Counting Our Reading Efforts |
| CORE | Crop Observation and Research Education |
| CORI | Concept Oriented Reading Instruction |
| CORPS | Collaboration, Outreach, Recognition, Performance, and Scholarship |
| CORRE | Cyber Outreach Risk Reduction Education |
| COS | Counselors Only Section |
| COSC | Cambuslang Out of School Care |
| COSEE | Center for Ocean Science Education Excellence |
| COSEE | Center for Ocean Sciences Education Excellence |
| COSEE | Centers for Ocean Science Education Excellence |
| COSER | Challenges Of Sustainability in Educational Research |
| CoSer | COoperative SERvice |
| COSL | Communication Of Student Learning |
| COSL | Council of School Leaders |
| COSLA | Chief Officers of State Library Agencies |
| COSMIC | Common Software Measurement Consortium |
| COSMOS | Community-Oriented Science and Mathematics Opportunities For Students |
| COST | Children Opposed To Smoking Tobacco |