Determine the nature of the definition: '‘Poor’ means having an annual income of ₹1000.'

Fixing 'poor' at an annual income of ₹1000 sharpens a normally vague term.

The word 'poor' has ordinary meaning but no exact borderline.

A precising definition adds a clear cut-off to remove that borderline vagueness.

It keeps the established sense yet makes the term usable for exact decisions.

Supplying such a numerical threshold is precisely this reducing-of-vagueness function.