A paragraph was a section of text within a written work that was at least one sentence in length.
Legal documents, Starfleet and station regulations and rule books for sports such as baseball were often divided into paragraphs to allow for easier citing. (TOS: "The Galileo Seven", "The Doomsday Machine", "The Omega Glory", TNG: "The Ensigns of Command", "In Theory", Star Trek Nemesis, DS9: "Captive Pursuit", "The Forsaken", "Family Business", "Bar Association", "Trials and Tribble-ations", "The Sound of Her Voice", "Tears of the Prophets", "Take Me Out to the Holosuite", VOY: "Equinox")
In 2152, while composing the preface to a book about his father, Jonathan Archer initially asked Enterprise NX-01's computer to delete the last paragraph before frustratedly asking it to delete the entire text. (ENT: "Singularity")
In 2368, Jean-Luc Picard recalled having read a book recently and having the impression he'd read paragraphs before. His explanation was that he thought he might have read it sometime in the past and forgotten. (TNG: "Cause and Effect")