n.
- short for ordinal number.
- Christian Church, historical a service book, especially one with the forms of service used at ordinations.
adj.
- relating to order in a series.
- Biology relating to a taxonomic order.
Etymology
ME: the noun from med. L. ordinale; the adjective from late L. ordinalis ‘relating to order’, from L. ordo, ordin- (see order).
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