delivering an order; dispatch of an order
Refers to the act of transmitting a command or message, often in a military or organizational context.
The delivery of the order was delayed, and the unit fell into confusion.
A person who carries orders or messages, especially in a military setting.
A messenger came running from headquarters.
伝令 is a military or official term for someone who delivers orders, whereas メッセンジャー is a broader, everyday word covering casual and digital messengers too.
Compound of 伝 (でん, 'transmit') and 令 (れい, 'order, command'). The reading is on'yomi.