Each time the dream was a promise out of our ancient

Each time the dream was a promise out of our ancient
articles of faith,phrases from the constitution,lines from
the great anthem of the nation,guarantees from the Bill of
Rights．all ending wim a vision that they might one day all
come true．
这里面的promise 是什么词性?名词?动词?

promise ['prɔmis]
n.许诺,允诺；希望
vt.允诺,许诺；给人以…的指望或希望
vi.许诺；有指望,有前途
这里promise前有a,是名词

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