def count_overall_frequency(tokenized_documents):
    """Count the overall occurence of all (tokenised) words through the
    whole corpus.

    """
    document_frequency = {}
    for document in tokenized_documents:
        for word in document:
            if word in document_frequency:
                document_frequency[word] += 1
            else:
                document_frequency[word] = 1
    return document_frequency
