フラット

(1) 粗さ、隆起、うねまたは不連続性のない表面を持つ(having a surface free from roughness or bumps or ridges or irregularities; "smooth skin"; "a smooth tabletop"; "smooth fabric"; "a smooth road"; "water as smooth as a mirror")(having a surface free from roughness or bumps or ridges or irregularities)

⇒鏡と同じぐらい静かな水面(having a surface free from roughness or bumps or ridges or irregularities)

(2) 商業的に無活動の(commercially inactive; "flat sales for the month"; "prices remained flat"; "a flat market")(commercially inactive)

⇒不活発な市況(commercially inactive)

(3) （音符について）1つの半音階的半音によってピッチを下げる((of a musical note) lowered in pitch by one chromatic semitone; "B flat")((of a musical note) lowered in pitch by one chromatic semitone)

⇒Bフラット((of a musical note) lowered in pitch by one chromatic semitone)

(4) 色調間の対比または陰影が欠けているさま(lacking contrast or shading between tones)

(5) 例えば、形またはテクスチャーのように変化を伴わず水平である、直線であるあるいは規則的であるさま同じ同一平面、または、何か他のものと同じ高さであること（すなわち、同等）(being level or straight or regular and without variation as e.g. in shape or texture; or being in the same plane or at the same height as something else (i.e. even with); "an even application of varnish"; "an even floor"; "the road was not very even"; "the picture is even with the window")(being level or straight or regular and without variation as e.g. in shape or texture)(or being in the same plane or at the same height as something else (i.e. even with))

⇒絵は窓と並行である(or being in the same plane or at the same height as something else (i.e. even with))

(6) 斜面のない表面を持つこと、一部分がもう一つより高くないまたは低くない傾斜(having a surface without slope, tilt in which no part is higher or lower than another; "a flat desk"; "acres of level farmland"; "a plane surface"; "skirts sewn with fine flat seams")(having a surface without slope, tilt in which no part is higher or lower than another)

⇒繊細な平たい縫い目で縫われたスカート(having a surface without slope, tilt in which no part is higher or lower than another)