subsidiarily
Subsidiarily is an adverb that denotes a secondary or subsidiary basis or manner. Derived from the adjective subsidiary, it belongs to formal or technical language and is used to indicate that something applies only as a fallback or auxiliary option, rather than as the primary rule. The word ultimately traces to Latin subsidium, meaning aid or support.
In legal writing, subsidiarily describes secondary liability or alternative remedies. For example, a party may be
Outside law, subsidiarily can appear in analytical or policy discussions to indicate that an argument or effect
Related terms include subsidiary, subsidiarity, and secondary liability.