Translation guide
The English word "fluctuation" refers to irregular changes in level, amount, value, or state. In Japanese, the most common equivalent is 変動 (hendō), but depending on context, words like 変動, 上下, 増減, 変わり, 波, ゆらぎ, and others are used. This guide organizes Japanese expressions by the type of fluctuation.
To describe irregular changes in economic indicators, numerical values, or measurable levels.
The most common and versatile word for fluctuation, especially in economic, financial, or statistical contexts. It implies change that is not necessarily regular.
Stock prices are fluctuating wildly.
Literally 'up and down', used for fluctuations that involve rises and falls, often in prices, temperatures, or levels.
Focuses on increase and decrease, often used for quantities, numbers, or amounts that go up and down.
A very general word for 'change', but can imply fluctuation in casual contexts. Less precise than 変動.
To describe physical or abstract undulating movements, oscillations, or variations that are not strictly up-and-down.
Refers to a gentle, often natural fluctuation or swaying, like a flickering flame or a wavering sound. Common in physics and poetic contexts.
To describe changes in mood, feelings, or mental state.
Literally 'ups and downs of mood', a common phrase for emotional fluctuation.
To describe random variations in data, measurements, or physical quantities.
In physics and statistics, 揺らぎ (often written in kanji) is the standard term for fluctuation, such as quantum fluctuation or thermal fluctuation.
変動 is the most general and can refer to any kind of change, not necessarily up and down. 上下 explicitly means up and down movement. 増減 focuses on increase and decrease in quantity. Use 変動 for economic indicators, 上下 for physical levels like temperature, and 増減 for countable changes.
In many contexts, English 'fluctuation' is not directly translated as a noun. Instead, use verb phrases like 変動する, 上下する, or descriptive phrases like 上がったり下がったりする.
The stock market experienced significant fluctuations.
Please pay attention to fluctuations in the exchange rate.
The temperature fluctuates a lot.
Fluctuations in prices affect the economy.
人口の増減を調べる。
To investigate fluctuations in population.
My mood fluctuates a lot.
Gazing at the fluctuation of the candle flame.
I feel a fluctuation in my heart/mind.
Literally 'wave', used metaphorically for fluctuations that come in waves, such as trends or cycles.
To ride the wave of economic fluctuation.
Also used for physical fluctuations, such as voltage or pressure changes.
To measure voltage fluctuation.
He has severe mood fluctuations.
Refers to emotional disturbance or agitation, a kind of fluctuation in one's mental state.
I can't hide my emotional fluctuation.
Can be used poetically for subtle emotional fluctuations.
To write about emotional fluctuations in a poem.
Quantum fluctuation occurs even in a vacuum.
Used in statistics for variation or fluctuation in data.
To analyze data fluctuation.
Refers to dispersion or variability, often used in quality control or statistics for fluctuation in measurements.
There is fluctuation in product quality.
一日の気温の上下が激しい。
There is a fluctuation in temperature throughout the day.