Definition of "Through" :
adjective: (of a route or journey etc.) continuing without requiring stops or changes
"A through street."
adjective: having finished or arrived at completion
"After the treatment, the patient is through except for follow-up."
adverb: throughout the entire extent
"Got soaked through in the rain."
adverb: over the whole distance
"This bus goes through to New York."
adverb: in diameter
"This cylinder measures 15 inches through."
adverb: from beginning to end
"Read this book through."
adverb: to completion
"Think this through very carefully!."