An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

1) Of or pertaining to time.
2) Pertaining to or concerned with the present life or this world; worldly.
3) Enduring for a time only; → temporary; transitory; → transient (opposed to eternal).
4) Secular, lay, or civil, as opposed to ecclesiastical.
5) Grammar: Of, pertaining to, or expressing time.

M.E., from O.Fr., from L. temporalis "of a time, but for a time, temporary," from tempus (genitive temporis) "time, season, proper time or season," of unknown origin.

Tâmeni, from tâmen, → time.

A measure of the correlation between the phases of an → electromagnetic wave at different points along the direction of propagation. Temporal coherence indicates to what extent a source is monochromatic. Imagine a source emitting waves with wavelength λ ± Δλ. Waves with wavelength λ and λ + Δλ, which at some point in space constructively interfere, will no longer constructively interfere after some path length l_c = λ²/(2πΔλ); l_c is called the → coherence length.

→ temporal; → coherence.

A unit of time used in the Roman and Ottoman empires that divided the day from sunrise to sunset into 12 equal numbers of hours, resulting in long summer hours and short winter hours.

M.E., from O.Fr. temporal, from L. temporalis "of time, temporary," from tempus (genitive temporis) "time, season, proper time or season," → time; → hour.

Sâ'at→ hour; fasli, of or pertaining to fasl→ season.

The measure of the ability of an observing system to clearly separate events in time. In other words, the shortest time interval that can be determined between two different events.

→ temporal hour; → resolution.

Temporal character or nature.

→ temporal; → -ity.