The quality of being carefully chosen as the best or most suitable.
Selectness is usually seen as a good thing because it means something has been chosen with care and thought.
Examples:
The selectness of the ingredients made the dish delicious.
Her selectness in choosing her friends shows she has good judgment.
The selectness of the team's players led to their victory.
The selectness of the puppy in choosing its owner was heartwarming.
The selectness of the costume for the play was so perfect, it looked like a dream.
The selectness of the words in the poem made it unforgettable.