Pecular: strange (Example: Marta thought the play was peculiar), Slightly and indefinably unwell (Example: I felt a little peculiar for a while) Special (in the sense of: different, characteristic, unique, ...) Specific, precise: Clearly defined or identified (Example: savings were made by increasing the electricity supply only until it met specific development needs) Special (adjective) - Better, greater, or otherwise different from what is usual Examples: 1. They always made a special effort at Christmas 2. He's trying to prepare a special surprise for her for their marriage anniversary. Exceptionally good or pleasant: Example : She’s a very special person Belonging specifically to a particular person or place (Example: Yuliana belongs to a special caste in classical ballet - she is a character dancer) Especial - 1. Better or greater than usual; specia (Example: These traditions are of especial interest to feminists) 2. For or belonging chiefly to one person or thing ( Example: Students and their problems were her especial concern)

In my opiniom all are correct and no meaning which one you use.