<p><strong>Preposition</strong></p><ul><li>in at one end, side, or surface and out at the other: to pass through a tunnel; We drove through Denver without stopping.</li><li>past; beyond: to go through a stop sign without stopping.</li><li>from one to the other of; between or among the individual members or parts of: to swing through the trees; This book has passed through many hands.</li><li>over the surface of, by way of, or within the limits or medium of: to travel through a country; to fly through the air.</li><li>during the whole period of; throughout: They worked through the night.</li><li>having reached the end of; done with: to be through one's work.</li><li>to and including: from 1900 through 1950.</li><li>by the means or instrumentality of; by the way or agency of: It was through him they found out.</li><li>by reason of or in consequence of: to run away through fear.</li><li>in at the first step of a process, treatment, or method of handling, passing through subsequent steps or stages in order, and finished, accepted, or out of the last step or stage: The body of a car passes through 147 stages on the production line. The new tax bill finally got through Congress.</li></ul><p><strong>Adverb</strong></p><ul><li>in at one end, side, or surface and out at the other: to push a needle through; just passing through.</li><li>all the way; along the whole distance: This train goes through to Boston.</li><li>throughout: soaking wet through.</li><li>from the beginning to the end: to read a letter through.</li><li>to the end: to carry a matter through.</li><li>to a favorable or successful conclusion: He barely managed to pull through.</li></ul><p><strong>Adjective</strong></p><ul><li>having completed an action, process, etc.; finished: Please be still until I'm through. When will you be through with school?</li><li>at the end of all relations or dealings: My sister insists she's through with selfish friends.</li><li>passing or extending from one end, side, or surface to the other: a through wound coming left to right and out the other side.</li><li>traveling or moving to a destination without changing of trains, planes, etc.: a through flight.</li><li>(of a road, route, way, course, etc., or of a ticket, routing order, etc.) admitting continuous or direct passage; having no interruption, obstruction, or hindrance: a through highway; through ticket.</li><li>(of a bridge truss) having a deck or decks within the depth of the structure.</li><li>of no further use or value; washed-up: Critics say he's through as a writer.</li></ul>