Adjective

(er)

quickly and critically discerning

shrewd or crafty

* 2014 , A teacher, " Choosing a primary school: a teacher's guide for parents", The Guardian , 23 September 2014:

The best headteachers are like submarine captains – cool-headed, astute decision-makers – who trust their colleagues and surroundings to indicate where their ship is headed.

Adjective

(en adjective)

Directly related, connected, or pertinent to a topic.

His mother provided some relevant background information concerning his medical condition.

Not out of date; current.

* {{quote-news, year=1973, date=December 20, title=Hansen says Christmas time for thanks, hope, work=The Aberdeen Times citation

, passage=The message of Christmas is still relevant as we near the end of a troubled year and the beginning of an uncertain but challenging new year.}}

* {{quote-book, year=2008, author=Scott Cooper, Fritz Grutzner, Birk Cooper, title=Tips and Traps for Marketing Your Business, publisher=McGraw-Hill, isbn=978-0071494892 citation

, passage=Motorola was quickly losing the cell-phone battle to Nokia for a time. When they launched the RAZR phone and combined it with their "Hello Moto" campaign, it made the brand relevant again.}}