countable noun. 1  A peninsula is a long narrow piece of land which sticks out from a larger piece of land and is almost completely surrounded by water. 2  a narrow strip of land projecting into a sea or lake from the mainland. 3  a land area almost entirely surrounded by water and connected with the mainland by an isthmus.
Northwestern Mutual Customer Service Phone Number Phone Number of Northwestern Mutual is +1-414-271-1444. Northwestern Mutual is one of the leading insurance company situated in the United States.
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