One quarter (1/4, ¼, 0.25).

One of five equal parts (1/5, ⅕, 0.2).

One of six equal parts (1/6, ⅙, 0.1666…).

One of two equal parts (1/2, ½, 0.5).

(chemistry) Taking place in a single reaction vessel

plural of sign on

plural of slip-on

Used other than figuratively or idiomatically: see in, one's, head. / (idiomatic, of information, a plan, etc.) Within one's intellect, memory, or mind.

present participle of cut one

Third-person singular simple present indicative form of rip one