Antonyms for optional


Grammar : Adj
Spell : op-shuh-nl
Phonetic Transcription : ˈɒp ʃə nl


Definition of optional

Origin :
  • 1765, from option + -al (1).
  • adj possible; available as choice
Example sentences :
  • The use of a Scripture lesson is, of course, optional with the pastor.
  • Extract from : « An Explanation of Luther's Small Catechism » by Joseph Stump
  • The manner of fastening the ribs to the frame pieces is optional.
  • Extract from : « Flying Machines » by W.J. Jackman and Thos. H. Russell
  • Hence we erase all optional marks in the 1st and 3rd rows, but let them stand in the 2nd.
  • Extract from : « A Tangled Tale » by Lewis Carroll
  • It never occurred to him that that duty was only optional with him now.
  • Extract from : « Once to Every Man » by Larry Evans
  • It is optional with the judges whether the use of a timepiece is to be allowed.
  • Extract from : « Boy Scouts Handbook » by Boy Scouts of America
  • After they have a school certificate, entrance to the works is optional.
  • Extract from : « A Journey Through France in War Time » by Joseph G. Butler, Jr.
  • The optional link (JK of fig. 7e) was used in the engines as built.
  • Extract from : « Kinematics of Mechanisms from the Time of Watt » by Eugene S. Ferguson
  • He was at that moment acutely aware that he did not want to do something which it was optional to do.
  • Extract from : « The Beautiful » by Vernon Lee
  • The use of books with this class of persons is not optional.
  • Extract from : « Questionable Amusements and Worthy Substitutes » by J. M. Judy
  • Some are disposed to look upon this matter as optional with them; but such is a mistake.
  • Extract from : « Sanctification » by J. W. Byers

Synonyms for optional

Based on : Thesaurus.com - Gutenberg.org - Dictionary.com - Random House Unabridged Dictionary, © Random House, Inc. 2019