Whilst not the first and consigned to full a gaping gap in the book market as the public readership and booksellers were dissatisfied with available grammars and lexicons, the rather heroic and singular academic undertaking by Samuel Johnson, A Dictionary of the English Language—first published on this day in 1755, was highly influential and considered the authoritative reference source until the introduction of the Oxford English Dictionary.

Opulence—wealth; riches; affluence
“There in full opulence a banker dwelt,
Who all the joys and pangs of riches felt;
His sideboard glitter’d with imagin’d plate,
And his proud fancy held a vast estate.”
Johnson’s work established the paradigm for standard dictionary entries with etymological speculation, usage and a guide to pronunciation and when the OED became its definitive successor some one hundred seventy years later, reproducing many of the former’s definitions, marking them with a J., judging his scholarship expedient and judicious to copy.