(Buddhism) summer according to the lunisolar calendar; the ninety days starting from the sixteenth day of the fourth month until the fifteenth day of the seventh month

the Xia dynasty (first dynasty of China) / Short for 大夏 (Daika): Xia, one of the Sixteen Kingdoms / Short for 西夏 (Seika): Western Xia, an empire during the Song dynasty / a surname

bath mat

optimization

to optimize

optimal solution

Ningxia

a female given name

summertime

summer festival