Let us consider the history of three homonyms:
board, n. — a long and thin piece of timber
board, n. — daily meals, esp. as provided for pay,
e. g. room and board board, n. — an official group of persons who direct
or supervise some activity, e. g. a board
It is clear that the meanings of these three words are in no way associated with one another. Yet, most larger dictionaries still enter a meaning of board that once held together all these other meanings "table". It developed from the meaning "a piece of timber" by transference based on contiguity (association of an object and the material from which it is made). The meanings "meals" and "an official group of persons" developed from the meaning "table", also by transference based on contiguity: meals are easily associated with a table on which they are served; an official group of people in authority are also likely to discuss their business round a table.
Nowadays, however, the item of furniture, on which meals are served and round which boards of directors meet, is no longer denoted by the word board but by the French Norman borrowing table, and board in this meaning, though still registered by some dictionaries, can very well be marked as archaic as it is no longer used in common speech. That is why, with the intrusion of the borrowed table, the word board actually lost its corresponding meaning. But it was just that meaning which served as a link to hold together the rest of the constituent parts of the word's semantic structure. With its diminished role as an element of communication, its role in the semantic structure was also weakened. The speakers almost forgot that board had ever been associated with any item of furniture, nor could they associate the concepts of meals or of a responsible