System and methods for determining sentiment based on context

A method for determining the connotation of a multi-term text unit, comprising:

• identifying a first term and a second term in a text unit comprising two or more terms;
• identifying a grammatical attribute associated with the terms in the text unit, where in the grammatical attributes includes at least the grammatical roles of a subject, an object, a head, a modifier, and parts of speech of a noun, a verb, a preposition, an adjective, and adverb;
• defining a group of terms comprising a subset of terms in a language, or attaching a label to a subset of terms in a language contained in a dictionary, based on the behavior pattern of the terms in determining the connotation of a multi-term text unit containing one of the terms;
• and
• determining the connotation of the text unit based on the group membership or the attached label of at least one of the terms in the text unit, and the grammatical attribute associated with at least one of the terms in the text unit, wherein the connotation of the text unit can be positive, negative, or neutral.