An early form of photographic material in which the photosensitive emulsion was applied to a glass plate; latterly only used by astronomers.

The tactics or strategies of an adversary can be also be used against him or her.

calm and quiet; peaceful; tranquil

It is allowable to retaliate against an enemy's dirty tricks by using the same ones against them. / Taking turns is morally right.

the planet Mars

Of or pertaining to a plane. / Flat, two-dimensional. / (graph theory, of a graph) Able to be embedded in the plane with no edges intersecting.

simple past tense and past participle of place

Alternative spelling of placename.

(idiomatic) In multiple directions or locations, often haphazardly; everywhere. / (idiomatic) Inconsistent; lacking a clear pattern; with a large amount of variation.

(astronomy) a ring of dust, moonlets and other matter that orbits a planet (such as Saturn) as a flat disc; gaps in the ring are due to the presence of shepherd moons