North Sea Germanic

North Sea Germanic, also known as Ingvaeonic (/ˌɪŋviːˈɒnɪk/ ING-vee-ON-ik),^[1] is a subgrouping of West Germanic languages that consists of Old Frisian, Old English, and Old Saxon, and their descendants. These languages share a number of commonalities, such as a single plural ending for all persons of the verb, the Ingvaeonic nasal spirant law, common changes to the Germanic vowel *a, a plural form -as, and a number of other features which make scholars believe they form a distinct group within West Germanic.

It is debated whether the shared features of North Sea Germanic are inherited from a common proto-language or formed via later contact and influence. Additionally, the membership of the group is sometimes debated. Some scholars exclude Low German for lacking a number of features associated with North Sea Germanic. Other scholars include Dutch for sharing some features with the group.