careful and persistent work or effort.
Middle English (in the sense ‘close attention, caution’): via Old French from Latin diligentia, from diligent- ‘assiduous’ (see diligent).
Diligence! It’s the sort of word that commands respect. “Be diligent, children”, says the kindergarten teacher to us. “Have you done your diligence?” says the trusted friend advising you on the job offer you just received. “Let’s do some diligence on this” we investors say gravely to each other after hearing a very impressive entrepreneur… …