1. in one side and out the other side of; from end to end of
2. 1. in the midst of flying through the clouds
   2. among hiking through the trees
3. by way of a train that goes through Boston
4. over the entire extent or surface of
5. to various places in; around touring through France
6. 1. from the beginning to the end or conclusion of to go through an experience, through the summer, went through all his provisions
   2. ☆ up to and including through Friday
7. without making a stop for to go through a red light
8. past the limitations or difficulties of to fight through all the red tape
9. by means of through her help
10. as a result of; because of done through error

Etymology: ME thurgh, thrugh < OE thurh, akin to Ger durch < IE base *ter-, through, beyond > L trans, across, Sans tiráḥ, through

adverb

1. in one side and out the other; from end to end
2. from the beginning to the end
3. completely to the end; to a conclusion to see something through
4. in every part or way; thoroughly; completely soaked through
   also through and through

adjective

1. extending from one place to another; allowing free passage a through street
2. ☆
   1. traveling to the destination without stops a through train
   2. continuing on without making a stop through traffic
3. ☆ not necessitating changes; good for traveling without intermediate transfer a through ticket
4. arrived at the end; finished through with an assignment
5. at the end of one's usefulness, resources, etc. through in politics
6. having no further dealings, connections, etc. (with someone or something)