na-adjective
alternative; either-or
Describes a situation where one must choose between two mutually exclusive options. Often used in formal or technical contexts.
その問題は択一的な解決策しかなかった。
The problem had only an either-or solution.
彼は択一的な選択を迫
He was forced to make an alternative choice.
Means 'options' or 'choices' in general, not necessarily limited to two. 択一的 implies a strict either-or dichotomy.
Derived from 択一 (たくいつ, 'choosing one') + 的 (てき, adjectival suffix). 択一 is a compound of 択 (select) and 一 (one).