速

Core meaning is the reduction of the interval between two points, whether spatial (distance) or temporal (time):

• Physical Velocity: Moving quickly; speed.
• Temporal Promptness: Acting without delay; promptness.
• Urgency: Haste or the act of hurrying.

• Adjective: Modifying a noun.
• Adverb: Modifying a verb to indicate manner; in early texts, this often occurs without an explicit adverbial marker.
• Verb: Can function as an imperative or directive ("Hurry," "Make haste," or "Dispatch quickly"), particularly when appearing at the start of a phrase or immediately preceding a destination.

• 速 vs. 疾 (jí): While both denote speed, 疾 often implies violence, intensity, or suddenness. 速 is more neutral, focusing on the rate of movement or administrative promptness.
• 速 vs. 迅 (xùn): 迅 typically suggests a sweeping, rapid motion—often associated with wind or a sudden strike—carrying an atmospheric quality of "swiftness," whereas 速 is more focused on efficiency.

// Phonology: Tang-period reading //suk*; Fanqie 桑谷 資昔.

• Variants: Semantic variants exist (e.g., U+8DE1), though these are primarily encountered in specialized paleographic contexts or specific manuscripts and are functionally equivalent to the standard form.

Distinguish between velocity (how fast something moves) and promptness (how soon something happens). In contexts involving messengers or responses, 速 often refers to the efficiency of the dispatch rather than the physical speed of the traveler.