Final answer:
The 12-letter word that pertains to the eerie or occult is 'paranormal', which includes direct and indirect experiences with supernatural elements and is a subject of psychical research and parapsychology.
Step-by-step explanation:
The 12-letter word meaning pertaining to the eerie or occult is paranormal. The term 'paranormal' encapsulates experiences and phenomena such as encounters with the supernatural, spirits, state religion, and a realm beyond what is perceptible by the senses. Such experiences might include direct encounters, like a mystical experience that seeks union with the deity or the supernatural, or indirect, such as witnessing a miracle. People's perennial fascination with the unknown and the mysterious has given rise to numerous studies and speculative thought. The academic study of the occult, aimed at understanding such phenomena, has evolved into the fields of psychical research and parapsychology, emphasizing the influence of mysticism and spirituality in our daily lives without encouraging involvement in occultism.