The wide body of information that a person acquires from education and from life; not all of it has practical use(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "general knowledge" in a sentence
"There are not in Pope's works such poignant discoveries of wit, or such a general knowledge of the humours and characters of men, as in the Prologues and Epilogues of Dryden, which are the best records of the whims and capricious oddities of the times in which they are written."
"The work of the great native Irish scholars O'Curry and O'Donovan, who first penetrated the difficult heritage of the Brehon Laws, and who from their marvelous and unique acquaintance with Irish manuscripts first gave the world a general knowledge of Irish literature, was succeeded by the more strictly scientific labours of Whitley Stokes, Father Edmund Hogan,"
"Secondly, I may have youths of (say) sixteen to eighteen years of age, sent out from such a school as Stephen Hawtrey's for example, who will come with a good general knowledge of ordinary things, and receive a special training from myself."