The wingspan of a condor can reach nine feet.

which word is the definite article?

THE

the word 'the' introduces a noun phrase (wingspan of a condor) and is specific to the condor.

the group received an extra pound of butter for christmas.

the annex was delighted to hear that we'll all be receiving an extra quarter pound of butter for christmas.

plagiarism is the act of taking one else's work and passing it off as one's own.

consequences of plagiarism include failure on the plagiarized assignment, grade reduction on given assignment, course failure, in-school suspension, and a possible chance of dismissal.