a.

1. 佔優勢的，支配的，統治的
   the dominant partner of a business

   公司中舉足輕重的合夥人

   The dominant influence in her life was her father.

   她一生中對她影響最大的是她父親。

2. 高聳的；佔首位的
   a dominant cliff

   高聳的懸崖

3. 【生】（遺傳性狀）優勢的，顯性的
4. 【音】全階第五音的

n.

1. 【音】全階第五音[C]
2. 【生】顯性；顯性狀（或基因）；優勢種[U][C]

adj.

1. most important, powerful, or influential.
   ▸Ecology  denoting the predominant species in a plant or animal community.
2. (of a high place or object) overlooking others.
3. Genetics  relating to or denoting heritable characteristics which are controlled by genes that are expressed in offspring even when inherited from only one parent. Often contrasted with recessive.

n.

1. Music  the fifth note of the diatonic scale of any key, considered in relation to the key of the tonic.
2. Genetics  a dominant trait or gene.
3. Ecology  a dominant species in a community.