Meaning of “subject line” in the English Dictionary

business-english dictionary

"subject line" in British English

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the space at the top of an email in which a line of text is written that tells you what the email is about, or the line of text itself:

He thought of a great subject line for the next marketing campaign.

(Definition of “subject line” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"subject line" in Business English

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subject linenoun [ C ]

uk us IT, COMMUNICATIONS

the short line at the top of an email that tells you the subject of the message:

State law requires that the emails include "ADV" in the subject line.

(Definition of “subject line” from the Cambridge Business English Dictionary © Cambridge University Press)