It is a colloquial term meaning, "about", "roughly", "approximately". It implies that the speaker is not too worried what the exact number, or value, or nature of some thing really is.
"More or less" is a phrase used to indicate an approximation or estimation. It suggests that something is somewhat close to a particular amount but may not be exact.
Accuracy and precision are synonyms. They both mean without error, they are exactly right, No more and no less.
It is exactly 442, no more, no less.
The value is exactly 19: no more, no less.
Exactly 34257. Not more, nor less.
Exactly as in the question no more and no less
Exactly 0.35 - nothing more, nothing less.
It is equal to 14. Exactly. Not more, nor less.
Exactly 20 metres: not more, nor less.
The answer is 65.
Exactly 250 - not more, not less.
less
That would be plumb gold, also expressed as 14kp. It is a mark indicating exactly 14 karats of gold, no less, no more. A mark of quality.