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developmentalist

[dih-vel-uh p-men-tl-ist] /dɪˌvɛl əpˈmɛn tl ɪst/
noun
1.
an expert in or advocate of developmental psychology.
Origin
1860-1865
1860-65; developmental + -ist
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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