Definition of keyboard for English Language Learners. : 1  a row or set of keys that are pushed to play a musical instrument (such as a piano) : 2  a musical instrument that is played by means of a keyboard like that of a piano and that produces sounds electronically. : 3  the set of keys that are used for a computer or typewriter.
Classless Inter-Domain Routing (CIDR, pronunciation: /ËsaÉªdÉr/ or /ËsÉªdÉr/) is a method for allocating IP addresses and IP routing. The Internet Engineering Task Force introduced CIDR in 1993 to replace the previous addressing architecture of classful network design in the Internet.
Definition of VCR for English Language Learners. : a machine that is used to make and watch video recordings of television programs, movies, etc. See words that rhyme with VCR Spanish Central: Translation of VCR Nglish: Translation of VCR for Spanish speakers Britannica English: Translation of VCR for Arabic speakers Britannica.com: Encyclopedia article about VCR.