重さ|おもさomosa

1. nounweight

• Synonym重量じゅうりょうNeutralFormal, technical term for weight, as in 「重量制限」. 「重さ」 is the most common everyday word and can also describe a heavy heart.
• Synonym目方めかたNeutralOld-fashioned word for the weight as measured, as in 「目方を量る」. Say 「重さ」 in daily speech; 「目方」 never covers abstract weight.
• Synonym重みおもみNeutralThe sense of weight, as in 「言葉の重み」; mostly abstract weight or value. 「重さ」 leans toward objective weight and degree.
• Synonym量目りょうめNeutralRare word for the measured quantity of goods. It only covers what the scale shows, not the abstract degree that 「重さ」 can express.
• Related掛け目かけめNeutralIn the weighing sense it can replace 「重さ」, but it also means a reference value for measuring or a collateral loan ratio; mostly commercial/financial and rare.
• Antonym軽さかるさNeutralLightness, as in 「軽さが魅力」; the direct opposite of 「重さ」, and like it covers both objects and degree.

Use 「重さ」 for an object's weight or degree of heaviness, as in 「荷物の重さ」 and 「責任の重さ」. For formal or technical contexts pick 「重量」, for the old-fashioned measured weight 「目方」, and for abstract weight 「重み」. The opposite is 「軽さ」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 重おもいこと。またその程度ていど。重おもみ。
2. （物理学ぶつりがく）重力じゅうりょくによって発生はっせいする力ちからの大おおきさ。質量しつりょうに重力じゅうりょく加速度かそくどを乗じょうじたもの。単位たんいにはニュートンのほかキログラム重じゅう、重量じゅうりょうキログラムが用もちいられる。
3. 俗ぞくに質量しつりょうのこと。