Use the adjective meaningful to describe something that has a purpose, like a political rally for a cause you believe in strongly.

You would probably say that your backpacking trip across Asia was meaningful, or worthwhile, but you might not describe three hours watching bad TV shows as meaningful. When something is important or significant, it is meaningful, or "full of meaning." Meaning itself comes from the word mean, which has its roots in the Old English m├Žnan, "to signify, tell, or complain."

Definitions of meaningful

adj having a meaning or purpose

“a meaningful explanation”
“a meaningful discussion”
“a meaningful pause”
meaty, substantive
being on topic and prompting thought
meaning, pregnant, significant
rich in significance or implication
having meaning through having an aim
serving as or indicating the existence of a purpose or goal
important, significant
important in effect or meaning
meaningless, nonmeaningful
having no meaning or direction or purpose
not important
empty, hollow, vacuous
devoid of significance or point
signifying nothing
lacking the thinking capacity characteristic of a conscious being
nonsense, nonsensical
having no intelligible meaning
not evidencing any purpose or goal
insignificant, unimportant
devoid of importance, meaning, or force
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