null

ヌル値、欠損値

使える情報が入力も保存もされていないことを示す値。

やさしい英語で： A value showing that no usable information has been entered or stored.

• The database returned a null.
• These records contain nulls instead of birth dates.
• Replace each null with a suitable default value.

類義語： null value, missing value

よく使う表現： return a null, contain a null, replace a null

帰無仮説

実際の差、効果、関連はないとする、研究で検証される仮説。

やさしい英語で： The idea tested in research that there is no real difference, effect, or connection.

• The results support the null.
• We rejected the null after analysing the data.
• Is this difference likely under the null?

類義語： null hypothesis

反対語： alternative hypothesis

よく使う表現： reject the null, test the null, under the null

ゼロ、空集合

数のゼロ、または集合に要素が一つもないことを示す記号。

やさしい英語で： The number zero, or a sign showing that a set contains nothing.

• Here, a null means zero.
• The empty set is represented by a null.
• She read the decimal as null point six.

類義語： zero

よく使う表現： a null, null symbol

無意味な記号、無

意味も効果も持たない記号や物。

やさしい英語で： A sign or thing that has no meaning or effect.

• This symbol is a null.
• The extra characters were treated as nulls.
• In this system, a null has no effect on the message.

類義語： nothing, nonentity

よく使う表現： a mere null, insert a null, treat as null

無効な

法的な効力がなく、適用したり履行を強制したりできないこと。

やさしい英語で： Having no legal force, so it cannot be used or enforced.

• The contract is null and void.
• The court declared their marriage null.
• Any agreement signed under pressure may be null.

類義語： invalid, void

反対語： valid

よく使う表現： null and void, declare something null, a null contract

打ち消す、ゼロにする

力や信号の効果を打ち消したり、機器をゼロに調整したりすること。

やさしい英語で： To remove or cancel the effect of a force or signal, or set equipment back to zero.

• Null the meter before measuring.
• The circuit nulled the unwanted signal.
• Can these two forces null each other out?

使い方： null out something (The device nulls out unwanted signals.)

類義語： cancel out, neutralize, zero

よく使う表現： null the signal, null out interference, null the meter