Simple past tense and past participle of label. (verb)
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Use "labelled" in a sentence
"There is also a "guide to the falls," who wears his title labelled on his hat; otherwise, indeed, one might as soon think of asking for a gentleman usher to point out the moon."
"Originally, materials do not come in labelled packages: you can make almost anything you are interested in."
"So into the dustbin labelled "idle thinking" went that policy too, to the despair of the dozens of very expert and dedicated people who worked countless hours to produce it – people who saw hope in a rejuvenated Conservative Party and who will never, ever vote Tory as long as Cameron is even a smear on the face of this planet."