spontaneous   (Sound)

The spontaneous has 2 Senses.

• spontaneous, self-generated
• 自然発症, 自然発症的
• happening or arising without apparent external cause; "spontaneous laughter"; "spontaneous combustion"; "a spontaneous abortion"
• 見た目の外因なしで起こるか、生じるさま

• unwritten, spontaneous, ad-lib
• said or done without having been planned or written in advance; "he made a few ad-lib remarks"
• 前もって計画されたか、書かれることなく言われたか行われた