1. ion engine

noun. A type of reaction-propulsion engine to propel rockets in space; a stream of positive ions is accelerated to a high velocity by an electric field.
Synonyms
reaction-propulsion engine reaction engine

2. engine

noun. (ˈɛndʒən, ˈɪndʒən) Motor that converts thermal energy to mechanical work.
Synonyms
reaction-propulsion engine geartrain reaction engine power train gear motor auxiliary engine donkey engine automobile engine train gearing camshaft heat engine generator aircraft engine
Antonyms
disqualify walk large big unattractive
Etymology
engine (English)
engin (Middle English (1100-1500))
engin (Old French (842-ca. 1400))
ingenium (Latin)

3. engine

noun. (ˈɛndʒən, ˈɪndʒən) Something used to achieve a purpose.
Synonyms
causal agent cause causal agency
Etymology
engine (English)
engin (Middle English (1100-1500))
engin (Old French (842-ca. 1400))
ingenium (Latin)

4. engine

noun. (ˈɛndʒən, ˈɪndʒən) A wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks.
Synonyms
self-propelled vehicle fender buffer steam locomotive railroad train electric locomotive railway locomotive dinkey switch engine locomotive donkey engine locomotive engine train footplate iron horse traction engine cowcatcher diesel locomotive tank locomotive shunter choo-choo pilot dinky tank engine pilot engine
Antonyms
dissuade
Etymology
engine (English)
engin (Middle English (1100-1500))
engin (Old French (842-ca. 1400))
ingenium (Latin)

5. engine

noun. (ˈɛndʒən, ˈɪndʒən) An instrument or machine that is used in warfare, such as a battering ram, catapult, artillery piece, etc..
Synonyms
mangonel ballista battering ram bricole instrument arbalist onager trebuchet trebucket catapult arbalest
Antonyms
stay in place afferent noncausative stator rotor
Etymology
engine (English)
engin (Middle English (1100-1500))
engin (Old French (842-ca. 1400))
ingenium (Latin)

6. ion

noun. (ˈaɪˌɑːn, ˈaɪən) A particle that is electrically charged (positive or negative); an atom or molecule or group that has lost or gained one or more electrons.
Synonyms
anion particle subatomic particle cation
Etymology
ion (English)
ἰόν (Ancient Greek (to 1453))
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