  The ubiquity of parametric resonance is continually evident in the repeated
experimental observations of this phenomenon in multiple physical systems. The
elementary case of 2 mode parametric resonance of order 1 involves the
excitation of a spectral tone of a parametrically driven mode at a sub-harmonic
frequency of the higher directly driven mode. Historically, such examples of
parametric resonance have been predominantly researched in a system of micro-
and nanoelectromechanical resonators. Here, in this paper, we break this
convention by showcasing a collection of experimental signatures in support of
the concept of "N-mode parametric resonance" using a number of elementary
microelectromechanical devices. Specifically, we present observations of 2, 3,
(2+3) and (3+3) mode parametric resonances demonstrating co-existence of
different regimes within the same device. In addition, we also present
observations of intrinsic "Four-Wave Mixing" of parametric excitations. This
paper presents contributions towards the existence proof for such multimode
parametric resonances which can also be exploited for engineering benefit
within the field of "micro and nanoelectromechanical resonators". The
experimental results further point towards the possibility of the ultimate
observation of N-mode parametric resonance in such physical system.
