What is the origin of 'sleep tight'?
Read moreOne of the mysteries of the English language finally explained.
1Statistics. = "multimodal".
2Music. Of, relating to, or designating music which uses two or more modes.
3Physiology. Of, relating to, or responding to more than one sensory (or other neural) modality.
Early 20th century; earliest use found in American Naturalist. From poly- + modal.