stato-, stat-, sta-, -static, -stasi, staso-, -stasis, -stasia, -stacy, -stitute, -stitution, -sist

(Latin: standing, to stay, to make firm, fixed; cause to stand, to put, to place, to put in place; to stand still)

assist
assistance
assistance (uh SIS tuhns)
1. Support; help, service; collaboration, cooperation: "The pilot needed the copilot’s assistance in landing the plane."
2. Financial support, contribution, charity, alms, relief, stipend, subsidy: "The public’s assistance is needed to build the orphanage."
assistance, assistants
assistance (uh SIS tuhns) (noun)
1. Support; cooperation: "The pilot needed the copilot’s assistance in landing the plane."
2. Financial support: "Public assistance is needed to build the orphanage."
assistants (uh SIS tuhnts) (noun)
Those who help someone, or who support a number of higher ranking people, to complete work assignments: "The new assistants in the office are very hard workers."

Yvette asked the mover, Kirk and his assistants, for their assistance in carrying her heavy boxes up the stairs.

assistant
assistants (uh SIS tuhnts)
Those who assist or help; aide, helper, second-in-command, associate; colleague, co-worker, collaborator, partner, ally, supporter: "The boss’s new assistants are really hard workers." "The doctors’ assistants at the hospital always seem to be available to help us whenever we call."
assisting
astasia
astasia (s) (noun), astasias (pl)
Motor incoordination with the inability to stand up: "The patient's astasia was the result of a limitation of or an absence of muscular coordination."
bacteriostasis
bacteriostat
barostat
A device that regulates and maintains pressure at a constant value within a chamber.
biostabilizer
A composting system that tumbles moistened soil waste in a drum until the waste biodegrades into a fine dark compost.
biostasis
The capacity of an organism to tolerate changes in its environment without undergoing adaptive change itself.
biostatistics
1. The science of statistics applied to biological or medical data.
2. Vital statistics; the numerical representation of conditions associated with life.

Related word families intertwined with "to place, placing, to put; to add; to stay; to attach" word units: fix-; pon-; prosth-; the-, thes-.