This is the 498th most frequent Hebrew word.
מסוים
Specific; particular.
The word "מסוים" (certain) describes a specific quality, here specifying a type of taste that is somewhat identifiable but not precisely named.
יש למזון הזה טעם מסוים שמזכיר לי אגוזים.
This food has a certain taste that reminds me of nuts.
The word "מסוים" (specific) implies that a particular type of work plan is essential and emphasized over a general idea.
בכדי להגיע להצלחה יש צורך בתוכנית עבודה מסוימת.
To achieve success, a specific work plan is needed.
The word "מסוים" (particular) indicates that the library is distinguished or singled out from others and identified contextually.