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adj.
giving pleasure or satisfaction or received with pleasure or freely granted; "a welcome relief"; "a welcome guest"; "made the children feel welcome"; "you are welcome to join us"
n.
a fundamental linguistic unit linking a signifier to that which is signified; "The bond between the signifier and the signified is arbitrary"--de Saussure
n.
an expression of some desire or inclination; "I could tell that it was his wish that the guests leave"; "his crying was an indirect request for attention"
adj.
suitable to your needs; "a congenial atmosphere to work in"; "two congenial spirits united...by mutual confidence and reciprocal virtues"- T.L.Peacock