a clear and telling mental image; "he described his mental picture of his assailant"; "he had no clear picture of himself or his world"; "the events left a permanent impression in his mind"
derived from experiment and observation rather than theory; "an empirical basis for an ethical theory"; "empirical laws"; "empirical data"; "an empirical treatment of a disease about which little is known"
any character from an ancient Germanic alphabet used in Scandinavia from the 3rd century to the Middle Ages; "each rune had its own magical significance"
not consisting of matter; "immaterial apparitions"; "ghosts and other immaterial entities"
(often followed by `to') lacking importance; not mattering one way or the other; "whether you choose to do it or not is a matter that is quite immaterial (or indifferent)"; "what others think is altogether indifferent to him"
of no importance or relevance especially to a law case; "an objection that is immaterial after the fact"