名詞 propulsion:

1. a propelling force
2. the act of propelling
   同義詞：actuation

1. And the propulsion method whether steam or diesel, you'll leave to us, I suppose?
   至于動力方式是采用“蒸氣式”抑或“柴油式”, 我想貴公司將交由我方全權處理吧？
2. A part or surface, such as a wing, propeller blade, or rudder, whose shape and orientation control stability, direction, lift, thrust, or propulsion.
   翼剖面; 機翼; 翼面一個部件或平面，如機翼、螺旋槳葉、方向舵等，其形狀或方位控制穩(wěn)定性、方向、抬升、沖擊或驅動
3. This aircraft works by jet propulsion.
   這架飛機是噴氣推進的。

pro.pul.sion

n.（名詞）
The process of driving or propelling.
推進：驅使或推進的過程
A driving or propelling force.
推進力：一種驅動或推進的力量

來源：
Medieval Latin prôpulsiô prôpulsiôn- [onslaught, urging on]
中世紀拉丁語 prôpulsiô prôpulsiôn- [攻擊，催促]
from Latin prôpulsus [past participle of] prôpellere [to drive forward] * see propel
源自 拉丁語 prôpulsus [] prôpellere的過去分詞 [向前驅動] *參見 propel

【引伸】
propul.sive 或
propul.sory