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Webster 1913 Edition

Adj.

[Also written

neighbourly

Appropriate to the relation of neighbors; having frequent or familiar intercourse; kind; civil; social; friendly.

–

adv.

In a neighborly manner.

Judge if this be

neighborly

dealing.

Arbuthnot.

, a.

Becoming a neighbor; kind; civil.

Judge if this be neighborly dealing.

Cultivating familiar intercourse; interchanging frequent visits; social. Friend, you are not neighborly.

adv.

With social civility; as, to live neighborly.

neighborly ‎(comparative neighborlier, superlative neighborliest)

American standard spelling of neighbourly.
He's very neighborly: he always collects my mail when I'm away on vacation.