Having no part excluded or left out; whole: I read the entire book. See Synonyms at whole. With no reservations or limitations; complete: gave us his entire attention. All in one piece; intact. Of one piece; continuous. Not castrated. Botany Not having an indented margin: an entire leaf. Unmixed or unalloyed; pure or homogenous. The whole; the entirety. An uncastrated horse; a stallion.