plural of sidereal period

plural of notice period

plural of question period

(physics) Half of the period of a wave etc; typically the time taken for part of a wave to be replaced by a similar part that is out of phase.

Time period between the receipt of the letter of dismissal and the last working day.

A period during which a new employee is monitored to assess his/her capability.

(Internet) The period of time at the launch of a new top-level domain or second-level domain during which trademark owners may register domain names containing their trademarks (to prevent cybersquatting).

plural of sunrise period

plural of periodic structure

(grammar) A sentence whose main clause appears at the end, after other, especially dependent, clauses. / (physics) A structure made of bays coupled through one or more coordinates.