through through /ˈθruː/

adjective

1. () Having finished or arrived at completion  ( through with , through , done )
   having finished or arrived at completion
    Certain to make history before he's done
   certain to make history before he's done
    It's a done deed
   it's a done deed
    After the treatment, the patient is through except for follow-up
   after the treatment, the patient is through except for follow-up
    Almost through with his studies
   almost through with his studies
   
2. (of a route or journey etc.) continuing without requiring stops or changes  ( through )
   (of a route or journey etc.) continuing without requiring stops or changes
    A through street
   a through street
    A through bus
   a through bus
    Through traffic
   through traffic
   

adverb

1. () From beginning to end  ( through )
   from beginning to end
    Read this book through
   read this book through
   
2. () Over the whole distance  ( through )
   over the whole distance
    This bus goes through to New York
   this bus goes through to New York
   
3. () To completion  ( through )
   to completion
    Think this through very carefully!
   think this through very carefully!
   
4. Throughout the entire extent  ( through , through and through )
   throughout the entire extent
    Got soaked through in the rain
   got soaked through in the rain
    I'm frozen through
   I'm frozen through
    A letter shot through with the writer's personality
   a letter shot through with the writer's personality
    Knew him through and through
   knew him through and through
    Boards rotten through and through
   boards rotten through and through
   
5. In diameter  ( through )
   in diameter
    This cylinder measures 15 inches through
   this cylinder measures 15 inches through
   

preposition

1. () Moving from one end or side to the other, often via an opening or space.  ( through )
   Moving from one end or side to the other, often via an opening or space.
   
2. () By means of; with the assistance of; through the act or agency of  ( through , by )
   by means of; with the assistance of; through the act or agency of
   
3. () Passing from one end or side to another or using as a means.  ( through , thru [Informal, American] , via )
   Passing from one end or side to another or using as a means.