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.
These parameters are subsequently employed in a simple statisti-cal model to evaluate the reliability of the design of coal refuse impoundments. 1 INTRODUCTION Coarse coal refuse (CCR) is commonly used to con-struct dams to retain a slurry of fine coal refuse (FCR) and water. A site investigation, and in-situ and laboratory testing programs are customarily per-formed to determine the necessary material proper-ties for static and seismic design of the dam.