礎|いしずえishizue[0]heiban (flat)

1. nounfoundation stone; cornerstone

• Synonym土台どだいNeutralThe base or foundation of a building; also an adverb meaning 'from the outset'. Common in speech, without the solemn, symbolic feel of 「礎」.
• Synonym礎石そせきWrittenA foundation or cornerstone; in written/formal prose, synonymous with 「礎」 and used mostly of buildings or figuratively.
• Synonym基礎きそNeutralThe most common word for a foundation or basis, as in 「基礎知識」; 「礎」 alone has solemn overtones of founding and pioneering.
• Synonym基底きていWrittenThe underlying base or bottom layer; also a term in mathematics. Written/formal prose.
• Synonym基盤きばんNeutralThe supporting base or infrastructure something rests on, as in 「生活基盤」; stresses the system that underpins it.
• Synonym根本こんぽんNeutralThe root or essence of a matter, as in 「根本的な解決」; stresses the source of things rather than a laid foundation.
• Related根底こんていNeutralThe very root or depths of something, as in 「根底から覆す」; stresses what lies deepest rather than a physical base.
• RelatedベースNeutralLoanword for a base or underlying tone, also a base in the military sense; common in colloquial speech.

「礎」 is for solemn, figurative talk of founding a nation or enterprise, as in 「平和の礎」. For general foundations use 「基礎」, a building's base 「土台」, casual speech 「ベース」. 「基盤」 is a supporting system, 「根底」/「根本」 the roots, 「基底」 formal or mathematical, 「礎石」 the stone.

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

1. （いしずえ）建造物けんぞうぶつの基もとになる部分ぶぶんに組み込くみこまれる石いし。