From Wikipedia:
The Sino-Japanese word "kaizen" simply means "change for better", with no inherent meaning of either "continuous" or "philosophy" in Japanese dictionaries or in everyday use. The word refers to any improvement, one-time or continuous, large or small, in the same sense as the English word "improvement". However, given the common practice in Japan of labeling industrial or business improvement techniques with the word "kaizen" (for lack of a specific Japanese word meaning "continuous improvement" or "philosophy of improvement"), especially in the case of oft-emulated practices spearheaded by Toyota, the word Kaizen in English is typically applied to measures for implementing continuous improvement, or even taken to mean a "Japanese philosophy" thereof. The discussion below focuses on such interpretations of the word, as frequently used in the context of modern management discussions.
From Wikipedia: