The Spanish word 'réplica' comes from the Latin verb 'replicare', which meant 'to fold back' or 'to reply'. This Latin word was formed by combining two parts: the prefix 're-' meaning 'back' or 'again', and the verb 'plicare' meaning 'to fold'. The original metaphorical meaning likely came from the idea of 'folding back' one's words in response to someone else's statement, which evolved into the modern meaning of a reply or response. The word also developed the meaning of an exact copy or reproduction (a replica).

Several common Spanish words share the same Latin root 'plicare' (to fold): 'plegar' (to fold), 'pliegue' (fold or crease), 'aplicar' (to apply), and 'complicar' (to complicate). You can see how the basic idea of 'folding' evolved into different but related concepts in these words.

Many English words are related to 'réplica' through the Latin roots 're-' and 'plicare'. Direct cognates include 'reply' and 'replica'. Other related English words include 'apply', 'complicate', 'explicit', 'implicate', 'pleat', and 'ply' - all of which contain the basic meaning of folding or bending in some way. For example, to 'apply' originally meant to fold or bend something toward something else, while 'complicate' literally meant to fold together.