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are prefixing

  • present progressive
    of prefix.
    prefix
    noun
    an affix placed before a word, base, or another prefix to modify a term's meaning, as by making the term negative, as un- in unkind, by signaling repetition, as re- in reinvent, or by indicating support, as pro- in proabolition. Compatible prefixes can work together, as un- and re- in unrefundable.

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A considerable majority of known languages are prefixing and suffixing at one and the same time, but the relative importance of the two groups of affixed elements naturally varies enormously.

From Language An Introduction to the Study of Speech by Edward Sapir

The Semitic languages, for instance, are prefixing, suffixing, and symbolic at one and the same time.

From Language An Introduction to the Study of Speech by Edward Sapir

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