Noun

(trajectories)

(astronomy, space) The path of a body as it travels through space.

(cybernetics) The ordered set of intermediate states assumed by a dynamical system as a result of time evolution.

Metaphorically, a course of development, such as that of a war or career.

*{{quote-magazine, date=2013-03

, author= , title=The Smallest Cell , volume=101, issue=2, page=83 , magazine= citation , passage=It is likely that the long evolutionary trajectory' of ''Mycoplasma'' went from a reductive autotroph to oxidative heterotroph to a cell-wall–defective degenerate parasite. This evolutionary ' trajectory assumes the simplicity to complexity route of biogenesis, a point of view that is not universally accepted.}}

Noun

(en noun)

The action of directing; pointing (something) or looking towards.

* 1835 , Sir , Sir (James Clark Ross), Narrative of a Second Voyage in Search of a North-west Passage …, Volume 1 , pp.284-5

Towards the following morning, the thermometer fell to 5°; and at daylight, there was not an atom of water to be seen in any direction .

Guidance, instruction.

The work of the director in cinema or theater; the skill of directing a film, play etc.

(archaic) An address.

* 1796 , , (The Monk) , Folio Society 1985, p. 218:

Her aunt Leonella was still at Cordova, and she knew not her direction .

The path or course of a given movement, or moving body; an indication of the point toward or from which an object is moving.

*

, title=(The Celebrity), chapter=4 , passage=Judge Short had gone to town, and Farrar was off for a three days' cruise up the lake. I was bitterly regretting I had not gone with him when the distant notes of a coach horn reached my ear, and I descried a four-in-hand winding its way up the inn road from the direction of Mohair.}}

* 1900 , , (The House Behind the Cedars) , Chapter I,

Just before Warwick reached Liberty Point, a young woman came down Front Street from the direction of the market-house. When their paths converged, Warwick kept on down Front Street behind her, it having been already his intention to walk in this direction .