If you try to find synonyms for the word "source", then you can easily see that there are not so many of them and all of them only partially reveal the meaning of this term. The tokens closest in meaning are: source, root cause, beginning, origin.
Dictionary Definition
The canonical definitions of the word "source" are reduced to two of its meanings. The first is something that gives rise to or is the foundation of something. The second meaning in which the word is most often used is the original source of information. As a rule, in the second case, most often we are talking about a document, or about an eyewitness, or about a direct participant in this or that event. At the same time, it is absolutely not necessary that this very source of information be true. Any lie is also born somewhere and also has its own starting point, from where it begins its journey. Thus, the source is a word indicating the place or object of occurrence or fixation of the occurrence of an event or information.
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The primary source of information is an extremely important element of public life, especially in the conditions of instant distribution of any information. In the process of transmitting information for various reasons, it undergoes certain distortions and conjectures, like a child’s game of a spoiled phone, which often leads to a change in meaning to the opposite. In this case, distortions can be introduced absolutely consciously. And such actions are the basis of propaganda, the purpose of which is to create an appropriate public opinion regarding certain events. Therefore, people who want to possess real information about reality must necessarily in any case look for and find the source of the information that has appeared. Even in cases when the informational occasion is covered with a veil of artificial sacredness. The source is the cornerstone of truth checking.