Bestiality definitions Webster's 1828 Dictionary BESTIAL'ITY, n. The quality ... 2: sexual activity between a person and an animal [syn: bestiality, zooerastia, zooerasty] Merriam Webster's noun (plural -ties) Date: 14th ... animal. Etymology: F bestialité (as BESTIAL) Webster's 1913 Dictionary Bestiality Bes*tial"i*ty, n. [F. bestialit['e].] 1. The ... Unnatural connection with a beast. Collin's Cobuild Dictionary 1. Bestiality is disgusting behaviour. (FORMAL) It is shocking that humans can behave with such bestiality towards others. 2. Bestiality is sexual activity in which a person has sex ...