一いち要よう素そMeanings1nounone element; one factorUsed when referring to a single component or factor in a system, analysis, or set.成せい功こうの一いち要よう素そは忍にん耐たいだ。One element of success is patience.この問もん題だいには多おおくの要よう素そがあるが、一いち要よう素そだけに注ちゅう目もくしてはいけない。This problem has many factors, but you shouldn't focus on just one element.