大きさ|おおきさookisa

1. nounsize; dimensions; volume
   その運河うんがは150,000重じゅう量りょうトンの大おおきさの船ふねを収容しゅうようできる。↗

   The canal can accommodate ships as large as 150,000 dead weight tons.

• Synonym寸法すんぽうNeutralMeasured dimensions like length, width and height, as in 「寸法を測る」; can also mean plans or arrangements. 「大きさ」 also covers volume and scale, without the measuring focus.
• SynonymサイズNeutralA loanword for the size of things; common in daily use and the usual word for clothing and shoe sizes. Mostly interchangeable with 「大きさ」.
• Synonym嵩かさNeutralBulk or volume, as in 「かさが増す」; focuses on how much space something takes up. 「大きさ」 is a general word for size.
• Synonym体積たいせきNeutralThe volume of a solid; a mathematics and physics term, as in 「体積を求める」. 「大きさ」 is the loose, everyday way to speak of size.
• Synonym容積ようせきNeutralThe amount a container can hold, as in 「タンクの容積」. 「大きさ」 describes outer size and is not limited to containers.
• Related規模きぼNeutralThe scale of organizations or activities, as in 「事業の規模」; not used for the size of objects. 「大きさ」 applies to both things and undertakings.
• Antonym小ささNeutralThe degree of being small, as in 「器の小ささ」. It only opposes the largeness sense of 「大きさ」; as a dimension word 「大きさ」 covers both big and small, so it has no such antonym.

Use 「大きさ」 for size in general, as in 「大きさを比べる」. Say 「サイズ」 for clothing and shoe sizes, 「寸法」 for exact measurements, 「規模」 for the scale of organizations or events, 「体積」 and 「容積」 for volume and capacity, 「嵩」 for bulk. 「小ささ」 only opposes the largeness sense.

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

1. 空間くうかんを占しめる程度ていど、大おおきい程度ていど。大小だいしょう。サイズ。
2. 規模きぼの甚はなはだしい程度ていど。大おおきいこと。