📖 For those terms that come up when reading R docs that you never quite understood…
de·fin·i·en·dum /diˌfinēˈendəm/ noun a word, phrase, or symbol that is the subject of a definition, especially in a dictionary entry, or that is introduced into a logical system by being defined.＊
＊ "definiendum, n.1." OED Online. Oxford University Press, June 2018. Web. 29 August 2018.