1. the quality of being pretentious (behaving or speaking in such a manner as to create a false appearance of great importance or worth)

    Synonym: pretentiousnesspretension

2. the property of having a relatively great size

    Synonym: bigness

3. large or extensive in breadth or importance or comprehensiveness

    e.g. the might have repercussions of unimaginable largeness
           the very extensiveness of his power was a temptation to abuse it

    Synonym: extensiveness

4. the capacity to understand a broad range of topics

    e.g. a teacher must have a breadth of knowledge of the subject
           a man distinguished by the largeness and scope of his views

    Synonym: breadthcomprehensiveness