Learner's definition of VALUABLE
[more valuable; most valuable]
2 : very useful or helpful
A lot of valuable advice/information can be found in this book.
I learned a valuable lesson.
He made many valuable contributions to the field of science.
The volunteers provide a valuable service to the community.
She is a valuable member of the staff.
He was named the league's most valuable player. [=the player who contributes the most to his team's success]
3 : important and limited in amount 4 : important to someone in a personal way