Entire is an adjective meaning whole or complete, with no part left out.
Common usages of entire include:
1. Referring to the whole of something: "I read the entire book in one night."
2. Emphasizing completeness: "The entire building was destroyed in the fire."
3. In biology: an entire leaf (having a smooth margin without teeth or lobes)
4. In mathematics: an entire function (a complex-valued function that is holomorphic at all finite points)