夏季休暇[kakikyuuka] summer vacation
季刊[kikan] quarterly (e.g. magazine)
季語[kigo] seasonal word (in haiku)
季候[kikou] season
季節[kisetsu] season

季節はずれ[kisetsuhazure] unseasonable
季節的[kisetsuteki] seasonal
季節風[kisetsufuu] seasonal winds
四季[shiki] four seasons
冬季[touki] (season of) winter

圧力調整器[atsuryokuchouseiki] pressure regulator
火力支援調整線[karyokushienchouseisen] fire support coordination line
企業整備[kigyouseibi] curtailment of business operations
境界調整[kyoukaichousei] alignment
均整[kinsei] symmetry

空気調整[kuukichousei] air conditioning
交通整理[koutsuuseiri] traffic control
再調整[saichousei] readjustment
残務整理[zanmuseiri] liquidation (of a company)
修整[shuusei] adjustment

おけさ節[okesabushi] style of Japanese folk song associated with Niigata Prefecture
双節棍[nunchaku] nunchaku (two linked fighting sticks)
一音節[ichionsetsu] monosyllable
一節切り[hitoyogiri] one-jointed bamboo musical instrument
音節[onsetsu] syllable

鰹節[katsubushi] katsuobushi
環節[kansetsu] segment (of worm)
関節[kansetsu] joints (knee joint, elbow joint, etc.)
関節リューマチ[kansetsuryuumachi] rheumatoid arthritis
関節炎[kansetsuen] arthritis

イ短調[itanchou] A minor
イ長調[ichouchou] A major
カーソル強調[kaasorukyouchou] cursored emphasis
ト短調[totanchou] G minor
ト長調[tochouchou] G major

ニ短調[nitanchou] D minor
ニ長調[nichouchou] D major
ハ短調[hatanchou] C minor
ハ長調[hachouchou] C major
ヘ短調[hetanchou] F minor