Usually means: Classless Inter-Domain Routing IP subdivision.
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We found 14 dictionaries that define the word CIDR:

General (3 matching dictionaries)
  1. CIDR: Wiktionary
  2. CIDR: Dictionary.com
  3. CIDR (disambiguation), CIDR, Cidr: Wikipedia, the Free Encyclopedia

Computing (7 matching dictionaries)
  1. CIDR: Free On-line Dictionary of Computing
  2. CIDR: CCI Computer
  3. BABEL: Computer Oriented Abbreviations and Acronyms (No longer online)
  4. CIDR (Classless Inter-Domain Routing): Linktionary Networking Glossary
  5. Webopedia (No longer online)
  6. I T Glossary (No longer online)
  7. CIDR: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Miscellaneous (2 matching dictionaries)
  1. CIDR: Acronym Finder
  2. AbbreviationZ (No longer online)

Tech (1 matching dictionary)
  1. CIDR: Webster's New World Telecom Dictionary

Definitions from Wiktionary (CIDR)

noun:  Acronym of Classless Inter-Domain Routing; normally an IP address notation such as 192.168.1.0/24 indicating a block of addresses. The number after the slash indicates how many bits are in the mask; bits to the right are not masked.
noun:  Initialism of controlled internal drug release (“technology for the controlled release of a hormone or drug, for example to release progesterone in beef cattle”).

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