INCUMBENT

Incumbant: (adj.) obligatory, required (n.) one who holds a specific office at a time spoken of

synonyms: (adj.) mandatory, necessary antonyms: (adj.) optional, unnecessary

Martin Luther King insisted that it was incumbant that people oppose unjust laws in a peaceful manner. In early 1963, Eugene "Bull" Connor was the Commissioner of Public safety in Birmingham, and was dedicating to suppressing the black civil rights movement.

It is incumbant that you complete the mountains of papers and reading assignments Mr. Mullen hands out lest your grade depreciates.

I wish that Bachmann would be running against incumbant Commander and Cheif Obama in the presidential race.