counterterrorist center: an agency that helps the Director of Central Intelligence coordinate counterterrorist efforts in order to preempt and disrupt and defeat terrorist activities at the earliest possible stage
unit: an organization regarded as part of a larger social group
titration: a measured amount of a solution of unknown concentration is added to a known volume of a second solution until the reaction between them is just complete; the concentration of the unknown solution (the titer) can then be calculated