noun
a function or purpose for which something is designed or exists
adjective
relating to or having a special activity, purpose, or task
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The new software update aims to improve the functional aspects of the program.
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I need a new phone that is more functional and user-friendly.
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I can't believe how functional this new gadget is!
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The team worked together like a well-oiled machine, each member playing a functional role in the project.