Related words 以い 下か 以下 means 'at most' or 'not exceeding' and includes the reference value, while 満たない strictly means 'less than' and excludes the reference value.
未み 満まん 未満 is a more formal, technical term for 'less than' used in legal or mathematical contexts, whereas 満たない is a verbal expression that can be used more broadly.
Written forms 満み たない
Standard written form for the expression meaning 'less than' or 'not reaching'.
満み たざる
Archaic or literary negative form of 満つ ; rarely used in modern Japanese except in fixed expressions or classical contexts.
みたざる
Etymology From the negative form of the verb 満つ (みつ , 'to be full, to reach a certain amount'), which is archaic in modern Japanese. The expression 満たない is now a fixed phrase meaning 'less than' or 'not reaching'.
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