拡散[kakusan] scattering
拡充[kakujuu] expansion
拡大[kakudai] magnification
拡大率[kakudairitsu] rate of magnification
拡張[kakuchou] expansion

拡張化[kakuchouka] enlargement
拡張可能[kakuchoukanou] extensible
拡張倍精度[kakuchoubaiseido] extended double-precision
繰拡げる[kurihirogeru] to unfold
軍拡[gunkaku] military expansion