Having an interest; concerned in a cause or in consequences; liable to be affected or prejudiced; as, an interested witness; an interested party.

having or showing interest; especially curiosity or fascination or concern; "an interested audience"; "interested in sports"; "was interested to hear about her family"; "interested in knowing who was on the telephone"; "interested spectators"

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"

Having the attention engaged; having emotion or passion excited; as, an interested listener.