March on Washington 50 th Anniversary Stamp. Fifty years after the March on Washington for Jobs and Freedom, the U.S. Postal Service is commemorating the August 28, 1963, event with a limited-edition Forever Â® stamp.irst day of issue: August 23, 2013 Washington, DC. 1963 March on Washington is being issued as a Forever Â® stamp. Forever stamps are always equal in value to the current First-Class Mail &reg one-ounce rate, which is $0.49.
lucency. Definitions: 1. In radiology, a region in an image caused by an absorber of lower x-ray attenuation than its surrounding tissues; in general, the opposite of opacity. The definition information for lucency is provided by Stedman's. You can search our medical dictionary here.. In radiology, a region in an image caused by an absorber of lower x-ray attenuation than its surrounding tissues; in general, the opposite of opacity. The definition information for lucency is provided by Stedman's.
Collinear points are points that lie on the same line. The word 'collinear' breaks down into the prefix 'co-' and the word 'linear.' 'Co-' indicates togetherness, and 'linear' refers to a line. So, collinear basically means points that hang out on the same line together.