noun
partial match
Computing term: a search or comparison where a substring within a field matches the query, rather than requiring an exact whole-field match.
このデータベースでは部分一致検索が可能です。
This database supports partial match searches.
完全一致 means exact match, where the entire field must match the query exactly, unlike 部分一致 which allows substring matches.
Compound of 部分 (part, portion) and 一致 (match, agreement). A straightforward technical term.