Noun

(en noun)

Mental acceptance of a claim as likely true.

*{{quote-magazine, date=2013-12-06, author=(George Monbiot)

, volume=189, issue=26, page=48, magazine=(The Guardian Weekly) , title= Why I'm eating my words on veganism – again , passage=The belief that there is no conflict between [livestock] farming and arable production also seems to be unfounded: by preventing the growth of trees and other deep vegetation in the hills and by compacting the soil, grazing animals cause a cycle of flash floods and drought, sporadically drowning good land downstream and reducing the supply of irrigation water.}}

Faith or trust in the reality of something; often based upon one's own reasoning, trust in a claim, desire of actuality, and/or evidence considered.

(countable) Something believed.

(uncountable) The quality or state of believing.

(uncountable) Religious faith.

(in the plural) One's religious or moral convictions.

Noun

(en-noun)

(uncountable, countable) Eager or inordinate desire for some object that confers distinction, as preferment, honor, superiority, political power, or literary fame; desire to distinguish one's self from other people.

My son, John, wants to be a firefighter very much. He has a lot of ambition .

* Burke

the pitiful ambition of possessing five or six thousand more acres

(countable) An object of an ardent desire.

My ambition is to own a helicopter.

A desire, as in (sense 1), for another person to achieve these things.

(uncountable) A personal quality similar to motivation, not necessarily tied to a single goal.

(obsolete) The act of going about to solicit or obtain an office, or any other object of desire; canvassing.

* Milton

[I] used no ambition to commend my deeds.