is a Japanese four-character idiom (yojijukugo) that describes a cultural concept of treasuring the unrepeatable nature of a moment. The term has been translated as "for this time only", and "once in a lifetime". The term reminds people to cherish any gathering that they may take part in, citing the fact that any moment in life  cannot be repeated; even when the same group of people  get together in the same place again, a particular gathering will never be replicated, and thus each moment is always a once-in-a-lifetime experience. The concept is most commonly associated with Japanese tea ceremonies, especially tea masters Sen no Rikyū and  Ii Naosuke.

History

The term can be traced back to the 16th century to an expression by tea master Sen no Rikyū: . Rikyū's apprentice Yamanoue Sōji instructs in Yamanoue Sōji Ki to give respect to your host . Ichigo () is a Buddhist term meaning "from one's birth to death", i.e. one's lifetime.

Later, in the mid-19th century, Ii Naosuke, Tairō (chief administrator) of the Tokugawa shogunate, elaborated on the concept in Chanoyu Ichie Shū:

Great attention should be given to a tea gathering, which we can speak of as "one time, one meeting" (ichigo, ichie). Even though the host and guests may see each other often socially, one day's gathering can never be repeated exactly. Viewed this way, the meeting is indeed a once-in-a-lifetime occasion. The host, accordingly, must in true sincerity take the greatest care with every aspect of the gathering and devote himself entirely to ensuring that nothing is rough. The guests, for their part, must understand that the gathering cannot occur again and, appreciating how the host has flawlessly planned it, must also participate with true sincerity. This is what is meant by "one time, one meeting."

This passage established the yojijukugo (four-letter idiomatic) form ichi-go ichi-e () known today.

Interpretation and usage

Ichi-go ichi-e is linked with Zen Buddhism and concepts of transience.  The term is particularly associated with the Japanese tea ceremony, and is often brushed onto scrolls which are hung in the tea room.

The term is also much repeated in budō (martial ways).  It is sometimes used to admonish students who become careless or frequently stop techniques midway to "try again", rather than moving on with the technique despite the mistake.  In a life-or-death struggle, there is no chance to try again. Even though techniques may be attempted many times in the dojo, each should be seen as a singular and decisive event. Similarly, in noh theater, performances are only rehearsed together once, a few days before the show, rather than the many times that are typical in the West, this corresponding to the transience of a given show.

In popular culture
 Romanian conductor Sergiu Celibidache's focus was on creating, during each concert, the optimal conditions for a what he called a "transcendent experience". Aspects of Zen Buddhism, such as ichi-go ichi-e, were strongly influential on him. 
 The 1994 movie Forrest Gump was released in Japan with this term in the subtitle as , reflecting the events that happen in the movie.
 The term is Hiro Nakamura's favorite phrase in the NBC series Heroes. 
 The term is used in an episode of the anime Azumanga Daioh. 
 It is also a song title in the soundtrack of Kareshi Kanojo no Jijo. 
 The term is used in the manga Boys Over Flowers and later several episodes of its 2005 adaptation. One of the series' main characters, Sojiro Nishikado, the son of a Grand Master, uses the term to pick up girls. He later realizes its true meaning when he misses the chance to be with his first love.
 It is also referenced in the title of the Kishi Bashi album 151a, which read in Japanese is pronounced "ichi-go-ichi ē".
 Indian Prime Minister Narendra Modi used the term to describe meetings between India and Japan during his state visit to the country on 11 November 2016.
 The term is the title in Mozart in the Jungle season 4 episode 8 and the episode revolves around a tea ceremony with the kanji characters of Ichi-go Ichi-e displayed in the room.
 The term also mentioned in Anthony Bourdain: Parts Unknown season 8 episode 6, "Japan with Masa".
 Ichigo Ichie is a Michelin-starred Japanese restaurant in Cork, Ireland.
 Ichi go Ichi e is the name of a ramen bar in Graz, Austria as well as in Linz, Austria.
 The name of Ichigo Inc., a Japanese real estate and renewable energy company, comes from Ichi-go ichi-e.
 Microhouse producer Guillaume Coutu Dumont produced a song called Ichi-go ichi-e
 Ichigo Ichie is the name of a cocktail made from Sake, Vermouth and Gin.

References

Chadō
Japanese aesthetics
Japanese words and phrases
Zen Buddhist philosophical concepts