dia
dia — abbreviation
1. a shortened written form of diameter, used in labels, measurements, and technica
a shortened written form of diameter, used in labels, measurements, and technical notes to show how wide a round object is from one side to the other through its center
The diagram labels the outer ring as 18 cm dia.
dia after a number in a diagram label
Rania ordered a 25 mm dia pipe for the bathroom repair.
The jeweler noted 6 mm dia beside the pearl on the form.
Please check that each hole stays the same dia after drilling.
文法句型
18 cm dia
25 mm dia pipe
hole dia
用法筆記
Used mainly in written measurements, tables, and diagrams, especially after a number. In ordinary sentences and speech, people usually say or write the full word diameter instead.
常見錯誤
2. the shortened name of the Defense Intelligence Agency, a United States military
the shortened name of the Defense Intelligence Agency, a United States military organization that collects and studies foreign security information
The newspaper said the DIA sent a warning to Congress.
the DIA as the subject of a news report
A reporter quoted a DIA officer during the briefing on missile tests.
DIA + officer
The chart compares the CIA, FBI, and DIA on one slide.
Mina read a DIA report before the security studies seminar.
- Defense Intelligence Agency
the full official name
文法句型
the DIA
DIA report
DIA officer
用法筆記
Written in capitals because it names one specific US agency. Distinguish from sense 1 and sense 3 by context: this sense appears in military, intelligence, or government reporting, not in measurements or medical notes.
常見錯誤
3. a shortened written form of diathermy, used in clinic schedules or treatment not
a shortened written form of diathermy, used in clinic schedules or treatment notes for heat-based medical therapy
The therapist wrote dia next to Tuesday's heat treatment.
dia in a treatment schedule
In the clinic notes, dia was scheduled after the shoulder massage.
The nurse crossed out dia when the patient reported skin pain.
Asha asked whether dia would be used before the stretching session.
- diathermy
the full medical term
文法句型
dia on the treatment chart
schedule dia after massage
cross out dia in the notes
用法筆記
This shorthand appears mainly in specialist medical writing where the treatment list is brief. In normal speech and patient-facing writing, the full word diathermy is much more likely.