第だい一いち楽がく章しょう

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Meanings

1

noun

first movement

Used in classical music to refer to the first movement of a symphony, sonata, concerto, etc.

No., residence

一one, one radical (no.1)

楽music, comfort, ease

章badge, chapter, composition

楽がく章しょう
楽章 means 'movement' in general; 第一楽章 specifies the first movement.
第だい二に楽がく章しょう
第二楽章 is the second movement, often slower and contrasting with the first.

Compound of 第一 (first) and 楽章 (movement of a musical piece). The term is a straightforward Sino-Japanese construction.