ダイヤ

だいや
noun
diamond; train schedule
1. diamond
A precious gemstone; the diamond suit in cards.
I received a diamond ring.
I played the three of diamonds.
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).
Train schedules are disrupted due to an accident.
After the typhoon, it took time for the train schedule to return to normal.
Starting next month, the timetable revision will add more morning trains.

ダイヤ has two main meanings:

1. DIAMOND:

2. TRAIN SCHEDULE (short for ダイヤグラム):

The train schedule meaning comes from the diagram (ダイヤグラム) showing train movements on a time-distance graph, historically shaped like a diamond pattern.

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).