I have done this that I may gain.
[§ 514]. Disjunctives.—Disjunctives (or, nor) are of two sorts, real and nominal.
A king or queen always rules in England. Here the disjunction is real; king or queen being different names for different objects. In all real disjunctions the inference is, that if one out of two (or more) individuals (or classes) do not perform a certain action, the other does.
A sovereign or supreme ruler always rules in England. Here the disjunction is nominal; sovereign and supreme governor being different names for the same object. In all nominal disjunctives the inference is, that if an agent (or agents) do not perform a certain action under one name, he does (or they do) it under another.
Nominal disjunctives are called by Harris subdisjunctives.
In the English language there is no separate word to distinguish the nominal from the real disjunctive. In Latin, vel is considered by Harris to be disjunctive, sive subdisjunctive. As a periphrasis, the combination in other words is subdisjunctive.
Both nominal and real disjunctives agree in this,—whatever may be the number of nouns which they connect, the construction of the verb is the same as if there were but one—Henry, or John, or Thomas, walks (not walk); the sun, or solar luminary, shines (not shine). The disjunctive isolates the subject, however much it may be placed in juxtaposition with other nouns.