Antonyms are words that have opposite meanings to a particular word. For the word "INT CIVIL ENG ABSTR," which may refer to international civil engineering abstracts, some of the antonyms include domestic, local, specific, concrete, and detailed. Domestic refers to something relating to internal affairs or within a country, while international denotes something extending across borders. Local is the opposite of global, meaning something that affects only a particular area or region. Specific means a particular thing or detail, while abstract refers to something that is conceptual or theoretical. Concrete, on the other hand, means something that is tangible or factual.