Unfortunately, quite a few very-well-defined terms have been made much-less-defined by use in practice.

"regular expression" has come to mean "anything that can be specified by a Perl 'RE' expression, which can backtrack and may take exponential time", rather than the original precise definition (that I will not give here) equivalent to "anything that can be accepted by a memoryless finite state automaton"

Similarly, "real time" has come to mean "on-line" or "computation happening more or less at the same time input is generated", as opposed to the original meaning of "guaranteed response to input within a pre-specified time frame" (which has been relegated to being "hard real time", with the amortized version often called "soft real time").

One could think software construction, being somewhat of an engineering discipline, would be more precise with terms - but one would be wrong; software construction as practiced today is something between an art and a craft, and is mostly not related to engineering.