It is important to maintain the ordering of the data.
このアルゴリズムは順序性を前提としている。
This algorithm assumes sequentiality.
整列 refers to the act of lining up or arranging in order, whereas 順序性 describes the abstract property of having an order.
Compound of 順序 (order, sequence) + 性 (property, nature). The exact historical derivation is uncertain, but the word follows a common pattern for forming abstract nouns in technical vocabulary.