feeling or showing worry or solicitude; "concerned parents of youthful offenders"; "was concerned about the future"; "we feel concerned about accomplishing the task at hand"; "greatly concerned not to disappoint a small child"
involved in or affected by or having a claim to or share in; "a memorandum to those concerned"; "an enterprise in which three men are concerned"; "factors concerned in the rise and fall of epidemics"; "the interested parties met to discuss the business"
in relation (or in regard) to; especially as in the phrases; "as far as x is concerned"; "where x is concerned"
a tentative theory about the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena; "a scientific hypothesis that survives experimental testing becomes a scientific theory"; "he proposed a fresh theory of alkalis that later was accepted in chemical practices"
a proposal intended to explain certain facts or observations
the branch of quantum physics that accounts for matter at the atomic level; an extension of statistical mechanics based on quantum theory (especially the Pauli exclusion principle)
soft coarse splintery wood of a hemlock tree especially the western hemlock
large branching biennial herb native to Eurasia and Africa and adventive in North America having large fernlike leaves and white flowers; usually found in damp habitats; all parts extremely poisonous
poisonous drug derived from an Eurasian plant of the genus Conium; "Socrates refused to flee and died by drinking hemlock"