The purpose of meiosis is to reduce the normal diploid cells (2 copies of each chromosome / cell) to haploid cells, called gametes (1 copy of each chromosome per cell). In humans, these special haploid cells resulting from meiosis are eggs (female) or sperm (male). In yeast cells, they are spores.
Third-party warrant is a derivative issued by the holders of the underlying instrument. Suppose a company issues warrants which give the holder the right to convert each warrant into one share at $500. This warrant is company-issued.
A warrant is a court-sanctioned document that authorizes a person, usually a law enforcement officer, to take a particular action. Many different types of warrants are available, including  criminal and civil warrants. A criminal warrant is typically used to secure evidence or apprehend suspects in criminal cases.