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.
The CIDR's nylon spine is covered with a progesterone-impregnated silicone skin. âCIDR is inserted for seven days,â says Cliff Lamb, University of Minnesota animal scientist. âThis causes the animal's blood progesterone concentrations to rise rapidly, with maximum concentrations reached within an hour after insertion.