The term apartheid means:

The term apartheid is an Afrikaans word that literally means "separateness" or "separation." It was used to describe the system of institutionalised racial segregation and discrimination that was enforced by the National Party government in South Africa from 1948 to 1994.

The word comes from the Afrikaans root apart (meaning "separate" or "apart") combined with the suffix -heid (equivalent to the English "-ness" or "-hood"). The policy was built on the principle of keeping the racial groups of South Africa - classified as White, Black, Coloured, and Indian - forcibly separated in virtually every aspect of public and private life, including residence, education, employment, public facilities, and marriage.

The other options represent concepts that are essentially the opposite of what apartheid stood for. Freedom, unity, and reconciliation all describe values that the anti-apartheid movement fought to establish. Reconciliation, in particular, became central to South Africa's post-apartheid transition under Nelson Mandela, most notably through the Truth and Reconciliation Commission established in 1995. Understanding the literal meaning of the term helps clarify why the policy was named as it was - it was, at its core, a system designed to enforce separation.