To have great knowledge is to be “erudite,” a word whose roots indicate being taken from (e- / ex-) the state of rudeness or from being untrained (rudis). You can see the latter portion in words like “rude,” “rudimentary”, and “rudiment.”

Since the secured building would not allow documents to leave its walls, it can be said that they would not leave the “intramural” space, which means the space within (intra) the walls “mural.” When the word “intramural” is used to describe sports, it means sports that occur within a given academic institution—within its walls as opposed to between two different schools. Note that “intra” IS NOT the same as “inter,” the latter meaning between and the former meaning within.

Even if you didn’t know what text messages were, you could guess that the contrast is between short remarks and real letters—an interpretation solidified by the closing word “letters.” The word “epistolary” means related to letters. It is derived from the Latin “epistola,” meaning letter, which has the related English derivate “epistle,” which also means letter.

The word “lexical” is derived from a Greek word meaning pertaining to words. Hence, Bonaventure was searching for such content since he believed the symbols had “some linguistic content” and were not merely symbols without meaning.

To be "urbane" is to be suave or courteous. It is directly derived from a Latin word that means almost the same thing and ultimately comes from the word for "city," (which we see in English words like “urban”). A person of “urbane” manners is one who is cultured for city life, as opposed to rustic life.

Strictly speaking something that is “ostensive” demonstrates something clearly and directly. By extension, this often is used to mean a definition that points to instances of the given concept. Even if one cannot clearly define the item in the abstract, such a definition does at least indicate clearly certain instances. The word is derived from the Latin “ostendere,” which means not only to show but also to point out; hence the applicability of the usage in our sentence.

As the young man was unable even to play the instrument, we could say that he lacks “competence” at the skill. The word is related to a number of “-pet” words, which are derived from the Latin root word for “to seek or attack.” Related English words are “petition,” “repetitive,” and so forth.

The derivation of the word’s meaning has been rather extended, however, by the prefix “com-,” which means with. One can see the meaning of these two roots more easily in the related “competition”—seeking with, in the sense that in a competition, the competitors are together seeking the same victory.

The expression here is metaphorical, so the knowledge of vocabulary is key. Isidore’s “glassy” stare could also be called “vitreous,” which means like glass. It is derived from the Latin word vitrum, meaning glass.

Since one can make quite a bit of money selling salt-water in the town, it is a rather profitable or lucrative business. This is derived ultimately from the Latin word lucrum, which means gain, profit, or even excessively greedy. The English word “lucre”, meaning money—particularly with connotations of being gained dishonorably, is from the same base.

To be “provincial” means to be from the provinces outside of a main city. Often, the added implication of the adjective is that such people are narrow-minded because they are unexposed to the supposed sophistications of city life.