noun
A person who conveys orders, announcements, or messages, often in a military, official, or formal context.
伝令者が司令部からの命令を前線に伝えた。
The messenger conveyed the orders from headquarters to the front line.
中世の戦場では、伝令者が重要な役割を果たした。
On medieval battlefields, heralds played an important role.
メッセンジャー is a common loanword for messenger in modern contexts, whereas 伝令者 sounds more formal or historical.
Compound of 伝令 (order, message) + 者 (person). The exact historical derivation is uncertain, but the word follows a standard Sino-Japanese pattern for agent nouns.