(informal)
25B6; noun they gave the go-ahead for the scheme : PERMISSION, consent, leave, licence, dispensation, warrant, clearance; authorization, assent, agreement, approval, endorsement, sanction, blessing, the nod; informal the thumbs up, the OK, the green light.
25B6; adjective go-ahead companies : ENTERPRISING, resourceful, innovative, ingenious, original, creative; progressive, pioneering, modern, forward-looking, enlightened; enthusiastic, ambitious, entrepreneurial, high-powered; bold, daring, audacious, adventurous, dynamic; informal go-getting.