ダイヤ

• Reading: ダイヤ
• Romaji: daiya
• Pronunciation: /da.i.ja/

Meaning

Railway timetable or schedule. Also means diamond (the gemstone or shape).

A loanword-based noun with two distinct meanings. In transportation contexts, ダイヤ is short for ダイヤグラム (diagram), referring to train schedules. In other contexts, it is short for ダイヤモンド (diamond). The railway meaning is especially common in daily Japanese life.

Examples

1. 台風の影響でダイヤが大幅に乱れている。 The train schedule is significantly disrupted due to the typhoon.
2. 新しいダイヤは来月から適用される。 The new timetable goes into effect starting next month.
3. 婚約指輪にはダイヤがついていた。 The engagement ring had a diamond on it.

Usage Guide

Context: transportation, news, daily life

Tone: neutral

Origin & History

Abbreviation of English 'diagram' (for railway schedules) and 'diamond' (for the gemstone). Both entered Japanese during the Meiji era with the introduction of railways and Western jewellery culture.

Cultural Context

Era: Modern

Generation: All ages

Social background: Universal