1530s, from Medieval Latin connotationem (nominative connotatio ), from connotat- , past participle stem of connotare "signify in addition to the main meaning," a term in logic, literally "to mark along with," from Latin com- "together" (see com- ) + notare "to mark" (see note ).
A word denotes its primary meaning, its barest adequate definition -- father denotes "one that has begotten." A word connotes the attributes commonly associated with it -- father connotes "male sex, prior existence, greater experience, affection, guidance."
The purpose of semantic is to propose exact meanings of the words and phrases and remove confusion, which might lead the readers to believe a word has many possible meanings. It makes a relationship between a word and the sentence through their meanings. Besides, semantic enables the readers to explore a sense of the meaning, because if we remove or change the place of a single word from the sentence, it will change the entire meanings, or else the sentence will become anomalous. Hence, the sense relation inside a sentence is very important, as a single word does not carry any sense or meaning.