The most common and most likely answer to this crossword clue is the 10 letter word PARAMETERS
I've seen this crossword clue in The Daily Telegraph
P
A
R
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M
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More clues leading to the result PARAMETERS
Buddy explains!
The straight part
We know that "boundaries" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case boundaries = parameters.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does PARAMETERS mean?
PARAMETERS noun- A value kept constant during an experiment, equation, calculation or similar, but varied over other versions of the experiment, equation, calculation, etc.
- A variable that describes some system (material, object, event etc.) or some aspect thereof
- An input variable of a procedure definition, that gets an actual value (argument) at execution time (formal parameter).
- An actual value given to such a formal parameter (argument or actual parameter).
- A characteristic or feature that distinguishes something from others.
- In the ellipse and hyperbola, a third proportional to any diameter and its conjugate, or in the parabola, to any abscissa and the corresponding ordinate.
- The ratio of the three crystallographic axes which determines the position of any plane.
- The fundamental axial ratio for a given species.