noun
first quarter (of the year)
Business term for January–March (Q1) in financial or fiscal contexts.
当社の第一四半期の売上は前年比で増加した。
Our company's first-quarter sales increased year-on-year.
Standard kanji spelling using 第一 (first) + 四半期 (quarter).
Variant with numeral １ instead of 一; common in business documents.
四半期 means 'quarter' in general; 第一四半期 specifically refers to the first quarter.
Compound of 第一 (first) and 四半期 (quarter).