one tenth; one hundredth; one percent; one tenth of a sun; one quarter ryō
Historical and technical unit of proportion. In modern contexts, often means 10% or 1%, depending on the field. The sun and ryō senses are archaic monetary/measurement uses.
This alloy contains one tenth gold.
In the Edo period, one bu was a quarter of a ryō.
分 is the base unit meaning 'one tenth' or 'one percent', and 一分 simply specifies a single instance of that same 分.
Written identically, 一分 read いちぶ means 'one tenth/percent', but read いっぷん it instead means 'one minute' of time — learners must rely on context to tell them apart.
一分 (いちぶ) denotes a fraction like one tenth or one percent, while the homophone 一部 (いちぶ) means 'a part' or 'one copy' of something, an unrelated sense.
ichibuban; Edo-period rectangular gold coin worth a quarter ryō
one field; a branch; a division
ichibukin; Edo-period rectangular gold coin worth a quarter ryō
ichibugin; Edo-period rectangular silver coin worth one quarter ryō
(not even) a bit; (not even) a hint; (not) an iota
Standard kanji spelling; high news frequency.
Numerical variant, common in tables and technical contexts.
Compound of 一 (one) and 分 (part, portion). The reading ぶ is the older Chinese-derived unit reading.