From WordNet (r) 2.0 (August 2003) [wn]:
formulation
n 1: a substance prepared according to a formula [syn:
preparation]
2: inventing or contriving an idea or explanation and
formulating it mentally [syn: conceptualization,
conceptualisation]
3: the style of expressing yourself; "he suggested a better
formulation"; "his manner of expression showed how much he
cared" [syn: expression]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Formulation \For`mu*la"tion\, n.
The act, process, or result of formulating or reducing to a
formula.
[1913 Webster]