How writers can use synonyms, essential definition, and extended definition to define unfamiliar terms or concepts to their readers

Writers can use different other common word having the same meaning with the unfamiliar word or can provide definition in an easy and simple way to make it understand to the readers.  

Explanation:

Unfamiliar concepts or unfamiliar terms are difficult to understand by the people as they are aware of it or its meaning. People can relate only to what they know and what they have learned. So writers can compare and contrast the unfamiliar term or concept with some familiar thing so that the people can understand them.

Besides the writers can also use synonym words for the unfamiliar word so it help the readers. The readers can also make an effort by defining the term and explaining the concept in the simplest possible way so that ordinary man can understand in a layman language. Readers can also use extended definition, that will help a lot.

the president was the speaker and it was a great part of history.

explanation:

video of the national aeronautic space administration's (nasa) coverage of president john f. kennedy’s address at rice university, houston, texas, concerning the nation's efforts in space exploration. in his speech the president discusses the necessity for the united states to become an international leader in space exploration and famously states, "we choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard."