indeterminate

adj

1. Not accurately determined or determinable.

   “Four miles to the east of Warmington, the River Cherwell flows into Cropredy under a bridge that in 1644 was the scene of another Civil War battle - with an equally indeterminate result.”

2. Imprecise or vague.
3. Not definitively or precisely determined, because of the presence of infinity or zero symbols used in any of several improper combinations.
4. With no genetically defined end, and thus theoretically limitless.
5. Not topped with some form of terminal bud.
6. Intersex.
7. Designed to allow the incorporation of future changes whose nature is not yet known.

   “It bears an affinity to the problem of indeterminate architecture—the indeterminate residential area.”

noun

1. (strict-sense)A symbol that resembles a variable or parameter but is used purely formally and neither signifies nor is ever assigned a particular value;

   “1892, Henry B. Fine, Kronecker and His Arithmetical Theory of the Algebraic Equation, Thomas S. Fiske, Harold Jacoby (editors), Bulletin of the New York Mathematical Society, Volume 1, New York Mathematical Society, page 179, Such a factor is therefore an integral function of x and the indeterminates u_1,u_2,…u_n with coefficients belonging to the domain of rationality (R',R,..) and may be represented by g(x,u_1,u_2,..u_n).”

   “2006, Alexander B. Levin, Difference Algebra, M. Hazewinkel, Handbook of Algebra, page 251, Let T=T_σ and let S be the polynomial R-algebra in the set of indeterminates y_i,τ_(i∈I,τ∈T) with indices from the set I×T.”

2. (strict-sense)A symbol that resembles a variable or parameter but is used purely formally and neither signifies nor is ever assigned a particular value; (loose sense) a variable.