This is the 602nd most frequent Catalan word.
particular
"Particular" in Catalan means "private" or "specific."
Here 'particularment' (adverbial form of 'particular') means 'especially,' emphasizing the interest level of the design.
El disseny és particularment interessant per la seva senzillesa.
The design is particularly interesting for its simplicity.
Here, 'particular' is used as an adjective meaning 'private', to describe a tutor who gives individualized lessons.
Tinc un professor particular que m'ensenya matemàtiques.
I have a private tutor teaching me mathematics.
In this case, 'particular' refers to 'specific' or 'distinct,' qualifying the type of interest mentioned.