For his 1755 "Dictionary of the English Language", he wrote definitions for more than 40,000 words
[DOC] [TLE] Smauel Johnson's Dictionary: 1755 First Edition [PAR] A Dictionary of the English Language: in which the words are deduced from ... 
Johnson wrote the definitions of over 40,000 words... illustrating the senses in ... 
his High Church and Tory propensities); and he adduced extensive and apt ... 
1755, in an edition of 2000 copies, it is estimated that slightly more than half 
survive.