pronoun, instrumental singular + emphatic particle
Analysis. iminā (instrumental singular of ima 'this') + va (emphatic particle, 'alone, just, even'). The -va emphasizes the proximal deictic force: 'with this very [thing], no other'.
Etymology. ima is the proximal demonstrative stem (this, here), cognate with Latin is-te (from *i-ste, 'that one'), Sanskrit imá. The root is the deictic particle *i- (pointing), related to English it and Latin is. The emphatic -va (alone, just) is an enclitic adverb without clear Indo-European cognates but attested across Middle Indo-Aryan.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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