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Proto-Indo-European (n.)

the hypothetical reconstructed ancestral language of the Indo-European family, by 1905. The time scale of the "language" itself is much debated, but a recent date proposed for it is about 5,500 years ago. 

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Dictionary entries near Proto-Indo-European

prothesis

prothonotary

protist

proto-

protocol

Proto-Indo-European

proto-language

proton

protoplanet

protoplasm

protostar