Kasuri ori (絣織) is the Japanese name for ikat, a process that includes fabric made using pre-dyed thread.
The simply indicates that a piece of fabric is woven using threads that were previously dyed, allowing the manufacturer to create designs by weaving colored threads instead of dying fabric after it is made. The technique usually results in richer, long-lasting colors and designs.
Pre-dyed thread has a large number of applications in textiles, placing itself between dyed or painted fabrics (such as in yūzen) and hand-sewn motifs.
There are more than a dozen differently named kasuri ori styles in Japan. The most recognizable and known style is doubtlessly the Nishijin style (Nishijin ori) from Kyoto.
The method of pre-dyeing fabric was likely imported from India through south-east Asian countries. It was later developed locally by adding colors and motifs unique to Japan.
Kasuri is also the name of a very common technique used in Japanese calligraphy and traditional paintings. It consists in the artist lifting the brush in the middle of a stroke, leaving characteristic "brush hair" marks and strokes.
A very well-known example of this is when the brush is lifted towards the end of a stroke, right before the brush runs out of ink.