one color; single color
Refers to something being of a single color, often used in design, art, or description.
She was wearing a dress of a single color.
using only one type of plant (in ikebana)
Specialized term in ikebana (Japanese flower arrangement) for an arrangement using only one kind of plant material.
earnest; single-minded; wholehearted
Obsolete adjectival noun meaning focused on one thing with sincerity or dedication. Not used in modern Japanese.
Creating an arrangement using only one type of plant in ikebana is surprisingly difficult.
In old documents, expressions like 'devoting oneself single-mindedly to study' can be found.
Compound of 一 (one) and 色 (color). The obsolete sense of 'earnest' likely developed from the idea of being of one mind or undivided focus.