Simple past tense and past participle of concentre.(verb)
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Use "concentred" in a sentence
"Flat upon the ground, the small army concentred on the igloo, and behind, deliciously expectant, crouched many women and children, come out to witness the murder."
"The property of this country is absolutely concentred in a very few hands, having revenues of from half a million of guineas a year downwards."
"The property of this country is absolutely concentred in a very few hands, having revenues of from half a million of guineas a year downwards … I am conscious that an equal division of property is impracticable."