"Definition:A haiku is a short poem that uses imagistic language to convey the essence of an experience of nature or the season intuitively linked to the human condition.
Notes: Most haiku in English consist of three unrhymed lines of seventeen or fewer syllables, with the middle line longest, though today's poets use a variety of line lengths and arrangements. In Japanese a typical haiku has seventeen "sounds" (on) arranged five, seven, and five. (Some translators of Japanese poetry have noted that about twelve syllables in English approximates the duration of seventeen Japanese on.) Traditional Japanese haiku include a "season word" (kigo), a word or phrase that helps identify the season of the experience recorded in the poem, and a "cutting word" (kireji), a sort of spoken punctuation that marks a pause or gives emphasis to one part of the poem. In English, season words are sometimes omitted, but the original focus on experience captured in clear images continues. The most common technique is juxtaposing two images or ideas (Japanese rensô). Punctuation, space, a line-break, or a grammatical break may substitute for a cutting word. Most haiku have no titles, and metaphors and similes are commonly avoided. (Haiku do sometimes have brief prefatory notes, usually specifying the setting or similar facts; metaphors and similes in the simple sense of these terms do sometimes occur, but not frequently. A discussion of what might be called "deep metaphor" or symbolism in haiku is beyond the range of a definition. Various kinds of "pseudohaiku" have also arisen in recent years. . ."
Definition: A haibun is a terse, relatively short prose poem in the haikai style, usually including both lightly humorous and more serious elements. A haibun usually ends with a haiku. Notes: Most haibun range from well under 100 words to 200 or 300. Some longer haibun may contain a few haiku interspersed between sections of prose. In haibun the connections between the prose and any included haiku may not be immediately obvious, or the haiku may deepen the tone, or take the work in a new direction, recasting the meaning of the foregoing prose, much as a stanza in a linked-verse poem revises the meaning of the previous verse. Japanese haibun apparently developed from brief prefatory notes occasionally written to introduce individual haiku, but soon grew into a distinct genre. The word "haibun" is sometimes applied to longer works, such as the memoirs, diaries, or travel writings of haiku poets, though technically they are parts of the separate and much older genres of journal and travel literature (nikki and kikôbun). See "haiku."