1 xz is a command line tool with syntax similar to that of gzip. 2  xzdec is a decompression-only tool smaller than the full-featured xz tool. 3  A set of shell scripts (xzgrep, xzdiff, etc.) have been adapted from gzip to ease viewing, grepping, and comparing compressed files.
Epoch (astronomy), a moment in time used as a reference for the orbital elements of a celestial body. Epoch (cosmology) or cosmologic epoch, a phase in the development of the universe since the Big Bang. Epoch (geology) or geologic epoch, a span of time smaller than a period and larger than an age.
Full Definition of DECADE. 1. : a group or set of 10: as a: a period of 10 years b: a division of the rosary that consists primarily of 10 Hail Marys. 2. : a ratio of 10 to 1: order of magnitude. The war lasted nearly a decade. 2  The bridge was built a decade ago. 3  The decade of the 1920s runs from January 1, 1920 to December 31, 1929. 4  the first decade of the 21st century.