OED
1.b.
1647 figurative. (a) The vocabulary proper to some department of knowledge or sphere of activity; the vocabulary or word-stock of a region, a particular speaker, etc. (b) A list of words or names.1647 This barbarous Term you will not meet In all Love's Lexicon. A. Cowley, Discretion in Mistress 66
1654 Fate, or Fortune, (in the Profane Lexicon, and in the Christians undiscovered Providence). R. Whitlock, Ζωοτομία [Zōotomia], or, Observations of the Present Manners of the English: Briefly Anatomizing the Living by the Dead. With an Usefull Detection of the Mountebanks of Both Sexes 419
1656 The vast and barbarous Lexicon Of Mans Infirmitie. A. Cowley, To Dr. Scarborough in Pindaric Odes iii
1720 All Silks, Velvets, Calicoes, and the whole Lexicon of Female Fopperies. J. Swift, Proposal Use Irish Manuf. 5
1751 Such, who, in the Lexicon of Party, may be found ranged under that title [Whig]. Earl of Orrery, Remarks Swift (1752) 25
1823 Fifty thousand heroes, name by name..Would form a lengthy lexicon of glory. Lord Byron, Don Juan: Canto VIII xvii. 119
1839 In the lexicon of youth..there is no such word As—fail! E. Bulwer-Lytton, Richelieu ii. ii. 362
1954 'European' in the South African lexicon, means anyone whose skin appears to be white, regardless of where he may have been born or brought up and what his parents may have been. R. St. John, Through Malan's Africa i. i. 12
1963 French-speaking Canadians..are developing a ‘standard’ form of Canadian French..with the same categories of variation (phonetics and lexicon) from the speech of the mother country as are found in American and Canadian English. American Speech vol. 38 143
1972 They constitute a regular part of his stylistic lexicon. Archivum Linguisticum vol. 3 1V 1973 These racial-identity labels are part of what can be called ‘the black lexicon’ (words that are used exclusively by black people) formulated to designate concepts derived from the unique experience of black people within their culture. K. Johnson in T. Kochman, Rappin' & Stylin' Out 142V 1973 He [sc. Mr. Ehrlichman] said the term 'deep six—meaning throw in the river—had not been 'part of my lexicon'. Times 31 July 6/7