Complimentary

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wiktionary

ref 

compliment +‎  -ary


etymonline

ref

complimentary (adj.)

1620s, "intended to express or convey a compliment," from compliment (n.) + -ary. In later use loosely meaning "free of charge."

取自“https://www.bigphysics.org/index.php?title=Complimentary&oldid=33751”