a.

1. 四倍的；四重的；四部组成的

n.

1. 四倍数

vt.

1. 使成四倍

vi.

1. 成为四倍

adj.

1. consisting of four parts or elements.
2. consisting of four times as much or as many.
3. (of time in music) having four beats in a bar.

v.

n.