In natural speech, Chinese uses tone sandhi rules, so because 定 (dìng) is a 4th-tone character, 一 changes to 2nd tone (yí) to make the phrase smoother to pronounce.
(numerical) one
(numerical) single, alone; only one
(adj) same
(adj) whole; all; throughout
(adj) concentrated; wholehearted
(adv) every time
(particle) used in the middle of a reduplicated verb
(adv) used before a verb or a verbal measure
(verb) decide; fix; set
(verb) subscribe to (a newspaper, etc.); book (seats, tickets, etc.); order (merchandise, etc.)
(adj) calm; stable
(adv) surely; certainly; definitely
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