Explore each form from the oldest known stage to today.
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The kanji 燃 is a phono-semantic compound, formed during the Shuowen Jiezi era (c. 100 AD) to clarify a specific meaning. Its semantic component is 火 (hi, "fire"), which directly indicates its association with burning and flames. The phonetic component is 然 (nen/zen), which itself originally meant "to burn" (a meaning now preserved in words like 自然, "nature," or "self-igniting"). Over time, the character 然 was borrowed for other grammatical and abstract uses, losing its primary association with fire. To resolve this ambiguity, the "fire" radical (火) was added to 然, creating the more specific character 燃 to unequivocally mean "to burn." Historically, the character evolved from its seal script form to the modern standardized shape used today in Japan. It was imported to Japan along with the bulk of the Chinese writing system, most significantly between the 5th and 8th centuries via Korean peninsular scholars and Japanese envoys to the Tang court. It was adopted into the Japanese language as a kanji, inheriting the meaning "to burn" and its Sino-Japanese readings (e.g., ネン from the Chinese phonetic, as in 燃焼 - nenshō). The native Japanese kun'yomi "moeru" or "mo-yasu" was assigned to the character based on its meaning. A key linguistic note is the relationship between 燃 and its phonetic component 然. This is a clear example of a "redundant" or "clarifying" character, where a determinative was added to an existing character that had lost its original concrete meaning. In modern Japanese, this etymological link is still visible, as 然 can be found in compounds related to combustion, such as 自然発火 (spontaneous combustion). The character 燃 powerfully captures the process of burning not just as a simple fire, but as a sustained, active combustion, reflecting its formation from a component meaning "so" or "thus" combined with "fire."