The crossword solution for the term 'substantial meaning' is PITH, which is an acronym for 'Point, Illustrate, Tell, and Highlight'. PITH is a technique used in public speaking to help emphasize the main points of a speech. It involves making a point, illustrating it with an example, telling a story to explain it, and highlighting the main points. This technique helps to ensure that the audience understands the speaker's message and remembers it afterwards.