ダイヤ

だいや

noun

diamond; train schedule

1. diamond

A precious gemstone; the diamond suit in cards.

ダイヤの指輪(ゆびわ)をもらった。

I received a diamond ring.

トランプのダイヤの 3(さん)を出(だ)した。

I played the three of diamonds.

婚約(こんやく)指輪(ゆびわ)には、小(ちい)さなダイヤがいくつも付(つ)いていた。

The engagement ring had many small diamonds set in it.

2. train schedule, timetable

The scheduled times for train operations (short for ダイヤグラム).

事故(じこ)で電車(でんしゃ)のダイヤが乱(みだ)れている。

Train schedules are disrupted due to an accident.

台風(たいふう)のあと、ダイヤが正常(せいじょう)に戻(もど)るまで時間(じかん)がかかった。

After the typhoon, it took time for the train schedule to return to normal.

来月(らいげつ)からダイヤ改正(かいせい)で、朝(あさ)の電車(でんしゃ)が増(ふ)える。

Starting next month, the timetable revision will add more morning trains.

ダイヤ has two main meanings:

COMMON COLLOCATIONS (diamond):

ダイヤの指輪(ゆびわ): diamond ring
ダイヤモンド: diamond (full form)
ダイヤ (cards): diamonds suit

COMMON COLLOCATIONS (train schedule):

ダイヤが乱(みだ)れる: schedule is disrupted
ダイヤ改正(かいせい): timetable revision
ダイヤ通(どお)り: on schedule

The train schedule meaning is short for ダイヤグラム (diagram), the time-distance chart railways use to plan train movements; it has nothing to do with diamonds.

For the card suit, ダイヤ is one of four suits: ハート (hearts), ダイヤ (diamonds), スペード (spades), クラブ (clubs).

Related Words

Synonym: ダイヤモンド (full form (more formal))

Related: 時刻表(じこくひょう) (timetable)

general

Added 2026.1.13 8:49 · Revised 2026.10.7 17:13

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