Classical Studies 2800A/B Chapter 4:
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Note that the textbook sometimes includes the suffix nt with the verb stem, as an alternate form. Sc-, scient-: to know [why does the textbook author do this? sci ent- ] Because the rules are to break down words into suffixes given in the textbook. The rule is that you have to break down a word into prefixes, stems, and suffixes given in the textbook. All modern languages came from earlier languages. Modern languages from the same mother are cognate. French, spanish, and italian are all cognate (from latin) Lexemes in these modern languages that were also present in the mother language are also cognate. Lexemes borrowed from any other language (even other cognate languages!) are called loanwords. Milk (english), milsch (german) and melk (dutch) are cognate. Miriku" (japanese) is a loanword. Parallels have to be established over many cognate lexemes and languages, because coincidences are common. Etymology is not simply seeking the origin of a lexeme.