Determination.

de·ter·mi·na·tion

/dəˌtərməˈnāSH(ə)n/

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noun

noun: determination

1. 1.

   firmness of purpose; resoluteness.

   "he advanced with an unflinching determination"

   synonyms:

   resolution, resolve, resoluteness; More

   antonyms:

   weak-mindedness, pusillanimity

2. 2.

   the process of establishing something exactly by calculation or research.

   "determination of molecular structures"

   synonyms:

   calculation, discovery, ascertainment, establishment, fixing, deduction, divination, diagnosis, discernment, check, verification, confirmation "the first determination of the speed of light"