There is no widely recognized dictionary definition for the term "Ollison." It appears to be a surname predominantly found in English-speaking countries. As such, it does not possess a specific definition apart from its association with individuals using it as a last name.
Surnames hold historical significance, often representing ancestral lineage, occupation, or geographic origins. While the surname "Ollison" does not have a well-documented etymology, it is likely a variant of the more common surname "Allison." "Allison" is derived from the medieval name "Alice," a variant of the Germanic name "Adalheidis," meaning "noble" and "kind" or "type."
As a surname, "Ollison" may have been formed as a result of regional, linguistic, or spelling variations over time. It is essential to understand that surnames have diverse origins and connotations, varying from one family to another. Therefore, the meaning of "Ollison" lies primarily within the context of the specific family or individual who bears the name.
In the absence of significant historical or linguistic documentation specifically pertaining to "Ollison," one must rely on the unique family history and personal associations of individuals with that surname to understand its significance and meaning.