This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Plural form of accession.

n. A collection of laboratory tests performed on a single sample.

v. Third-person singular simple present indicative form of accession.

"THE ENGLISH LANGUAGE is derived chiefly from the Saxon, Danish, Celtic, and Gothic; but in the progressive stages of its refinement, it has been greatly enriched by accessions from the Greek, Latin, French, Spanish,"

accessioned    accessioning    accessions   

acquisition    attainment    agreement    increment    increase   

coming    addition    deed of accession   

augmentation    enlargement    increase    addition   

Hessian    aggression    compression    concession    confession   

influx    accessions    diminution    acquisition    outlay