同質|どうしつdoushitsu[0]heiban (flat)

1. no-adjective, na-adjectivesame quality; same nature; homogeneous

• Synonym均一きんいつWrittenWritten style. Says quantities or degrees show no difference, as in 「均一価格」; 「同質」 is about things sharing the same nature.
• Synonym一様いちようWrittenWritten style. Says everything is alike, and can also mean ordinary; 「同質」 speaks of nature.
• Synonym同一どういつWrittenWritten style. Means completely identical, one and the same thing; 「同質」 only says the natures match, not that it is the same object.
• Synonym均質きんしつWrittenWritten style. Says every part of one thing is uniform in quality; 「同質」 compares the natures of several things.
• Synonym等質とうしつWrittenWritten style. Close in sense to 「同質」 and 「均質」 but used far less often.
• Related同様どうようNeutralNeutral and very widely used for things being the same or similar, even roughly so; 「同質」 is reserved for sameness of nature or quality.
• Related同等どうとうWrittenWritten style. Says degree or rank is the same; 「同質」 is about nature or quality instead.
• Related同然どうぜんNeutralNeutral. Says something is virtually the case, as in 「死んだも同然」; 「同質」 states that natures are the same.
• Related画一かくいつWrittenWritten style. Means making everything uniform while ignoring individual circumstances or character; 「同質」 neutrally notes the same nature.
• Related一律いちりつNeutralNeutral. Says all cases are treated by one standard, as in 「一律千円」; 「同質」 is about nature or quality.
• Related等しいひとしいNeutralNeutral. Says two things are equal or equivalent, often numerically; 「同質」 speaks of texture or nature.
• Related同じおなじNeutralNeutral and the most general word for same or identical; 「同質」 is narrower, specifically about matching nature or quality.
• Related画一的かくいつてきNeutralNeutral. Suggests monotonous uniformity with no individuality, often critically; 「同質」 is a neutral statement of shared nature.
• Related同質的どうしつてきWrittenWritten style. Adjectival form meaning of the same nature; essentially synonymous with 「同質」.
• Antonym異質いしつWrittenWritten style. The direct opposite of 「同質」: it says natures or qualities differ.

For general sameness, 「同じ」 and 「同様」 are the everyday choices. Use 「同質」 when things share the same nature or quality, 「均質」 when every part of something is uniform, and 「画一的」 for uniformity that ignores individuality (often critical). 「異質」 is the antonym for differing natures; the others are narrower, each tying sameness to something specific — degree, rank, quantity or identity.

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

1. 複数ふくすうの事物じぶつの質しつが同おなじであること。
2. 複数ふくすうの事物じぶつの質しつが同おなじであるさま。