| Noun | 1. | CIS - an alliance made up of states that had been Soviet Socialist Republics in the Soviet Union prior to its dissolution in Dec 1991 Synonyms: Commonwealth of Independent States |
| 1. | (standard, programming) | CIS - Case Integration Services. | |
| 2. | (networking) | CIS - Cooperative Information System. | |
| 3. | (business) | CIS - Customer Interaction Software, Customer Information Systems. |
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