1. A method of determining lexical association for phrasal terms, the method comprising: receiving a text having a plurality of words; determining a plurality of contexts, wherein a context comprises one or more context words proximate to a word in the text; for each context, determining a first frequency based on a number of occurrences of the context within the text; assigning a first rank to at least one context based on the first frequency for the at least one context; for each word-context pair, determining a second frequency based on a number of occurrences of the word being used in the context; assigning a second rank to at least one word-context pair based on the second frequency for the at least one word-context pair; determining a rank ratio for each word-context pair equal to the first rank divided by the second rank; determining a mutual rank ratio based on one or more rank ratios; and identifying a phrasal term using the mutual rank ratio.