Adjective : an indispensable member of the staff. ,an indispensable obligation.    From Dictionary.com. 

He perfectly understands the indispensableness of thorough organization, and absolute and watchful discipline.    From Wordnik.com.  [The International Monthly, Volume 2, No. 4, March, 1851] Reference

Another time the Bibliotaph said to the Squire, calling to mind the well-known dictum as to the indispensableness of certain books.    From Wordnik.com.  [The Bibliotaph and Other People] Reference

A constitutional conservatism puts liberty first and teaches the indispensableness of moderation in securing, preserving and extending its blessings.    From Wordnik.com.  [Conservatives Can Unite Around the Constitution] Reference

And, surely, it is hardly necessary to argue the question as to the indispensableness of this blessed experience, in order to gain an entrance into heaven.    From Wordnik.com.  [The Theology of Holiness] Reference

When each contributes to the other, elements of character necessary to convenience and happiness, the mutual esteem and respect generated by the knowledge of the indispensableness of each to the other's interest, is the surest guard to amiability.    From Wordnik.com.  [How to Become Rich A Treatise on Phrenology, Choice of Professions and Matrimony] Reference

How rich her life had always been in the conviction of usefulness -- nay, indispensableness!.    From Wordnik.com.  [Robert Elsmere] Reference

A part of the Baptist denomination also through their popular preachers, if not in their recognised symbols assert the indispensableness of ritual baptism to salvation.    From Wordnik.com.  [The Destiny of the Soul A Critical History of the Doctrine of a Future Life] Reference

From the greatness or rather indispensableness of the good at stake, the opportuneness and even necessity of preventive and strictly binding measures undoubtedly follow.    From Wordnik.com.  [The Catholic Encyclopedia, Volume 3: Brownson-Clairvaux] Reference

Diderot constantly insists on the propriety, the importance, the indispensableness of keeping the provinces of science and philosophy apart from the province of theology.    From Wordnik.com.  [Diderot and the Encyclopædists (Vol 1 of 2)] Reference

His belief in the power of God's grace was the foundation of the most intense conviction of the reality and indispensableness of his own power, and was the motive which stimulated him to vigorous action.    From Wordnik.com.  [Expositions of Holy Scripture Second Corinthians, Galatians, and Philippians Chapters I to End. Colossians, Thessalonians, and First Timothy.] Reference

But latterly, presuming upon his own indispensableness, from his perfect knowledge of all the domestic arrangements, and upon his master's weakness, he had fallen into great irregularities and neglect of his duties.    From Wordnik.com.  [Narrative and Miscellaneous Papers] Reference

Christians, as the Valentinians did, but also the indispensableness of their faith as the foundation of speculation, Origen like Clement avoided the dilemma of becoming a heterodox Gnostic or an ecclesiastical traditionalist.    From Wordnik.com.  [History of Dogma, Volume 2 (of 7)] Reference

Partly to show the indispensableness of this act, it may here be stated, that, in the old Dutch fishery, a mop was used to dash the running line with water; in many other ships, a wooden piggin, or bailer, is set apart for that purpose.    From Wordnik.com.  [Moby-Dick, or, The Whale] Reference

And in this present case, besides the indispensableness of the story to the proper comprehension of our own improved answer to the Sphinx, the story has a separate and independent value of its own; for it illustrates a profound but obscure idea of.    From Wordnik.com.  [Memorials and Other Papers — Complete] Reference

This, they maintained, could be scarcely regarded as an infringement of the treaty, since the Moors would be so great gainers on the score of their eternal salvation; to say nothing of the indispensableness of such a measure to the permanent tranquillity and security of the kingdom.    From Wordnik.com.  [The History of the Reign of Ferdinand and Isabella the Catholic — Volume 2] Reference

But the idea of accurate method had to be made very familiar to men by the successes of physical science in the search after truths of one kind, before the indispensableness of applying it in the search after truths of all kinds had extended to the science of the constitution and succession of social states.    From Wordnik.com.  [Rousseau (Volume 1 and 2)] Reference

In so far as we have to raise a doubt of the unconditional authority of the rules followed by the old French tragic authors, of the pretended affinity between the spirit of their works and the spirit of the Greek tragedians, and of the indispensableness of many supposed proprieties, we find an ally in Voltaire.    From Wordnik.com.  [Lectures on Dramatic Art and Literature] Reference

Perfectly comprehending and appreciating the genius of the youth entrusted to his charge, deeply interested in his spiritual as well as worldly welfare, and strongly impressed with the importance of enlisting his pupil's energies in favour of that existing order, both moral and religious, in the truth and indispensableness of which he was a sincere believer.    From Wordnik.com.  [Venetia] Reference

He felt that his biggest mistake on Earth had been his feeling of indispensableness—that his ideas and discoveries were more important than anyone else’s and had to be kept intact.    From Wordnik.com.  [When Animals Speak] Reference

&c. were exhausting themselves in proofs of the indispensableness of this idea, they were fighting with shadows; for no man had ever questioned the practical necessity for such an idea to the coherency of human thinking.    From Wordnik.com.  [The Uncollected Writings of Thomas de Quincey—Vol. 1 With a Preface and Annotations by James Hogg] Reference