icular
&gt; technical purpose.
&gt;
&gt; Even in science (including mathematics and computer technology)
&gt; most terms are "natural" or "irregular" except when they are
&gt; formally defined for a specific purpose, whose scope lasts
&gt; only for the duration of a single book, article, manual,
&gt; or computer program.
&gt;
&gt; As examples, consider the terms "space" and "time" in ordinary
&gt; language, Newtonian mechanics, Einstein's relativity, and more
&gt; recent theories of cosmology.  People who h