noun
Refers to a postal or courier service that delivers items faster or with special handling, often at an extra charge.
この書類は別配達で送ってください。
Please send these documents by special delivery.
速達 is the more common term for 'express delivery' in Japan Post services, while 別配達 is a less frequent synonym for 'special delivery'.
Compound of 別 (separate, special) and 配達 (delivery). The exact historical origin is uncertain, but it follows a common pattern for forming service-related nouns.