Japanese

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For pronunciation and definitions of せっせん – see the following entries.
接戦
[noun] close combat
[noun] a close race, a close competition
[verb] fight at close quarters
[verb] have a close race, have a close competition
接線
[noun] (geometry) a tangent
Alternative spelling
切線
(This term, せっせん (sessen), is the hiragana spelling of the above terms.)