The concept of tilde is a much complex if one takes into account that he is confused with the concept of accent. It is important to point out here that all words have accent. The accent is intonation or the power that is given to a part of the word, more specifically to a syllable, when speaking. However, the tilde is not exactly the same. The tilde is not anything other than the graphic representation of some of these accents, not all.
The function of the tilde is precisely marked in writing where is the emphasis on the word for words that have a marked accent and requiring greater emphasis in its pronunciation. The tilde is always represented as a hairline that is placed diagonally on the letter of the accented syllable.
According to each language, there may be several ways to tilde. While, for example, English has not any kind of accent, other languages such as the Spanish Yes. In the case of the French, for example, not only are the same the Spanish tilde (also referred to as acute accent) but also the grave accent (the same accent but tilted to the other side) and the circumflex accent which is represented as a union of the two tildes.
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