百花斉放：ひゃっかせいほう [hya-kka-sei-hou]

学問・科学・文化・芸術活動などが、自由にまた活発に行われること。いろいろな花が一斉に咲き開く意から。

Academic, scientific, cultural, artistic activities etc are freely and actively done. Because various flowers bloom all together at once.