a.

1. 順序的
   You need to use ordinal numbers here.

   這裡需要用序數。

2. 【生】"目"的
   Please provide the family and ordinal names of the animal.

   請提供這個動物的科名和目名。

n.

1. 序數[C]
   "First" is an ordinal.

   "第一"是個序數。

n.

1. short for ordinal number.
2. Christian Church,  historical a service book, especially one with the forms of service used at ordinations.

adj.

1. relating to order in a series.
2. Biology  relating to a taxonomic order.