Thru, the informal version of the word through, is defined as completely or to the end.
An example of thru as an adverb is the phrase drive through town, which means to drive completely around a town.
Informal through: informal except on traffic signs
- (Canada, US, informal, possibly nonstandard) Alternative spelling of through.
- Thru is mostly used where the preposition through could be used (e.g. Monday thru Friday); it is less common as an adjective or adverb (I'm thru with the vacuuming). It is less used in formal situations, except in cases where brevity is wanted such as roadway signs or date ranges.
- This spelling is not used in standard British English, though it can be used as an abbreviation - similar to thro' that's still sometimes seen - and is recently becoming noticeable via American-based companies.
- It is often - in both American and British English - used in professional drafting (5/8"³ thru hole) to save space and simplify annotation on a drawing for fabrication or construction.
American English; proposed as a phonetic and simplified spelling of through in 1839.