BSD: /B-S-D/ n. [abbreviation for `Berkeley Software
Distribution'] a family of Unix versions for the DECVAX and
PDP-11 developed by Bill Joy and others at Berzerkeley starting
around 1980, incorporating paged virtual memory, TCP/IP networking
enhancements, and many other features. The BSD versions (4.1, 4.2,
and 4.3) and the commercial versions derived from them (SunOS,
ULTRIX, and Mt. Xinu) held the technical lead in the Unix world
until AT&T's successful standardization efforts after about 1986;
descendants are still widely popular. Note that BSD versions going
back to 2.9 are often referred to by their version numbers, without
the BSD prefix. See 4.2, Unix, USG Unix.
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