1 [more dedicated; most dedicated] : having very strong support for or loyalty to a person, group, cause, etc.
the band's most dedicated [=devoted] fans
They are a group of highly dedicated [=committed, enthusiastic] individuals.
He is a dedicated teacher. = He is dedicated to the teaching profession.
2 always used before a noun, technical : used only for one particular purpose
We have a dedicated phone line for our computer. [=a phone line that we use only for our computer]