(historical) An effect supposedly produced on a child in the womb as a result of a powerful mental or physical influence on the mother; thought to explain birth defects etc. before the modern understanding of genetics.

plural of maternal impression

The event when one person first encounters another person and forms a mental image of them. ᵂᵖ

plural of artist's impression

(law) A statement made by a person (the declarant) that conveys his or her sense of the state of an event or the condition of something, made spontaneously while the person was perceiving (i.e. contemporaneous with) the event or condition, or immediately thereafter.

plural of present sense impression

In the manner of an impression or stamp.