Verb
- simple past tense and past participle of concentre
concentred
English Wiktionary. Available under CC-BY-SA license.
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"concentred." YourDictionary, n.d. Web. 14 December 2018. <https://www.yourdictionary.com/concentred>.
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concentred. (n.d.). Retrieved December 14th, 2018, from https://www.yourdictionary.com/concentred
