noun, na-adjective, noun which may take the genitive case particle 'no'
Refers to something being required or necessary. Often used in contexts like budgeting or planning.
I listed the necessities for the trip.
This month we have a lot of expenses, so it's tough.
Specifically refers to monetary costs or outlays. Overlaps with sense 1 but emphasizes financial expenditure.
The moving expenses cost more than expected.
Standard kanji spelling.
Irregular kanji usage; not standard.
Common abbreviated spelling.
Uncommon kana-mixed spelling.
Irregular kanji usage; not standard.
Compound of 入り (iri, 'entering' or 'needed') and 用 (yō, 'use' or 'business'). The exact historical derivation is uncertain, but the spelling conventionally associates with things that are required.