| CI | any of a numerous plants grown for their 5-petal flowers |
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| CI | a federation of North American industrial unions that merged with the American Federation of Labor in 1955 |
| CI | a message written in a secret code |
| CI | a secret method of writing |
| CI | a person of no influence |
| CI | a quantity of no importance |
| CI | a mathematical element that when added to another number yields the same number |
| CI | make a mathematical calculation or computation |
| CI | convert ordinary language into code |
| CI | an oral antibiotic (trade name Cipro) used against serious bacterial infections of the skin or respiratory tract of urinary tract or bones or joints |
| CI | an oral antibiotic (trade name Cipro) used against serious bacterial infections of the skin or respiratory tract of urinary tract or bones or joints |
| CI | of or relating to biological processes occurring at 24-hour intervals |