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in·ter·grade | \ ˌin-tər-ˈgrād 
\
\intergraded; intergrading; intergrades
Definition of intergrade
(Entry 1 of 2)
: to merge gradually one with another through a continuous series of intermediate forms
intergrade
nounin·ter·grade | \ ˈin-tər-ˌgrād \
\Definition of intergrade (Entry 2 of 2)
: an intermediate form
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The first known use of intergrade was in 1874
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