What does anxiety and anxious mean?

i have heard these words so many times but when i thought about it i dont know what it means.
this is to do with language

anxious |ˈa ng (k) sh əs|
adjective
1 experiencing worry, unease, or nervousness, typically about an imminent event or something with an uncertain outcome : she was extremely anxious about her exams.
• [ attrib. ] (of a period of time or situation) causing or characterized by worry or nervousness : there were some anxious moments.
2 [usu with infinitive ] wanting something very much, typically with a feeling of unease : the company was anxious to avoid any trouble | [with clause ] my parents were anxious that I get an education.
DERIVATIVES
anxiously |ˈøŋ(k)ʃəsli| adverb
anxiousness |ˈøŋ(k)ʃəsnəs| noun
ORIGIN early 17th cent.: from Latin anxius (from angere ‘to choke’ ) + -ous .
USAGE Anxious and eager both mean ‘looking forward to something,’ but they have different connotations. Eager suggests enthusiasm about something, a positive outlook: : I’m eager to get started on my vacation. Anxious implies worry about something: : I’m anxious to get started before it rains.

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