Abstract:
As a means the communication, both printed and electronic media hold an important role to the development of language. That‘sbecame a source for people to get factual information or news, whether national or international news because nowadays printed and electronic media are more global. Newspaper is one of mediasused to report news or information and express of people‘s opinion. In newspapers, the readers may confuse because the writer use ambiguous words, phrase or sentences. The scope of this research is semantics as the study of word meaning and sentence meaning. Meanwhile, the researcher limits the study onthe types ofambiguities appeared in the articles of the online news of The Jakarta Post. The objectives of this research are (1) to describe thetypes of ambiguities found in the articles of online news of The Jakarta post, (2) To find out the causal factors of most dominant types of ambiguities appeared in the articles of the online news of The Jakarta Post. The results of the research are the most common ambiguity found in the articles of the online news of the Jakarta post is lexical linguistic in which there are 25 lexical linguistic. Meanwhile the least ambiguity found in the articles of the online news of the Jakarta post is extra linguistics ambiguity and the causal factors of ambiguity in the articles of the online news of the Jakarta post are polysemy, interpretation, immediate constituents, parts of speech, compound word and determiner. Polysemy is the most common causal factors.