段だん階かい的てき

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Meanings

Describes a process that advances in distinct stages or steps, rather than all at once or continuously. Often used in formal or technical contexts.

段だん階かい的てきに導どう入にゅうするto introduce something gradually, in stages
新あたらしい制せい度どは段だん階かい的てきに導どう入にゅうされる予よ定ていだ。
The new system is planned to be introduced in stages.
段だん階かい的てきに廃はい止しするto phase something out gradually
古ふるい設せつ備びは段だん階かい的てきに廃はい止しされる。
The old equipment will be phased out gradually.
段だん階かい的てきな〈事こと〉a gradual, step-by-step (approach, change, etc.)
この問もん題だいには段だん階かい的てきなアプローチが必ひつ要ようだ。
This problem requires a step-by-step approach.
段だん階かい的てきに〈動どう詞し〉to gradually do something (e.g. increase, reduce) in stages
税ぜい率りつは段だん階かい的てきに上あげられる予よ定ていだ。
The tax rate is scheduled to be raised gradually, in stages.

漸ぜん進しん的てき
段階的 emphasizes progress through distinct, separate stages, while 漸進的 emphasizes a smooth, gradual advance that may not have clearly marked steps.
徐じょ々じょにN3
徐々に is an adverb meaning 'little by little' with a focus on smooth continuous change, whereas 段階的 is a na-adjective describing a process that moves through discrete stages.

一いっ気きにN2
段階的 describes something done in stages over time, while 一気に describes something done all at once in a single burst.
一いっ斉せいにN2
段階的 means proceeding stage by stage, whereas 一斉に means everyone or everything acting simultaneously, with no staggering.

Formed from 段階 (stage, phase) + 的 (-like, -ive), a common pattern for creating adjectival nouns from nouns.