A lexeme is a unit of linguistic analysis. It belongs to a particular syntactic category and has a particular meaning ( semantic value). Lexemes may be simple words, phrasal and compound words and shortened forms. A lexicon consists of lexemes.
... Pole and came further south than anyone before him
John Hanning Speke, (1827-1864), discovered Lake Victoria
Henry Morton Stanley, (1841-1904), found back Livingstone; ...