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

To think carefully about, especially in order to make a decision; contemplate; reflect on (dictionary.com).

M.E. consideren, from O.Fr. considerer "reflect on, study," from L. considerare "to examine, look at closely," literally "to observe the stars," from → com- "with" + sider (stem of sidus) "star, group of stars," → sideral.

Âgâridan, from intensive prefix â- + gâr-, variants gar-, gâl- "to consider, observe," as in engâridan "to suppose," negaristan "to observe, look, notice," segâl "thought," segâlidan "to think, meditate," ultimately from Proto-Iranian *kar- "to observe, to consider;" cf. Av. kar- "to remember; to impress on memory;" Skt. kal- "to observe, consider," kalayati "considers, observes."

1) Rather large or great in size, distance, extent, etc.
2) Worthy of respect, attention, etc.; important; distinguished (dictionary.com).

→ consider; → -able.

The act or an instance of considering.

→ consider; → -tion.