Meaning of 積替 in Japanese

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Definition of 積替

せき(seki) 【積】

かわる(kawaru) 【替わる ·代わる ·換わる ·替る ·代る ·換る】

(v5r, vi) to succeed; to relieve; to replace
ジムは、ベティーにかわって手紙を書いた。
Jim wrote the letter for Betty.
to take the place of; to substitute for; to take over for; to represent
to be exchanged; to change (places with); to switch