Serving as a support or aid; having a subsidiary or supplementary function.
From Latin adminicularius (supporting), variant of adminicularis, from adminiculum. The -ary suffix variant creates a similar adjectival meaning. Both -ar and -ary forms appear in English technical language with minimal difference.
This is a fascinating example of how English allows us to form word variants—adminicular and adminiculary mean almost the same thing, but adminiculary sounds slightly more formal and archaic, which is why you'd see it in very old legal documents.
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