Definition of "omnidirectional"

The radiation pattern of an omnidirectional antenna looks like a doughnut, with the antenna in the center of the doughnut, as depicted in Figure 17.1.

2004, Harold Davis, Absolute Beginner's Guide to Wi-Fi Wireless Networking, Que Publishing, page 227

The ascendancy of the offensive over the defensive stems particularly from the ability of advanced weapon systems to penetrate enemy defenses. The combination of great speed and great altitude, taken together with numbers during a mass launch, ensures that selected targets will be reached. Improvements clearly possible through the use of decoys, multiple warheads, electronic countermeasures, varying trajectories, maneuverability, feinting, and omnidirectional attack will further increase the ability penetrate defenses.

1959, Air University Quarterly Review, Volumes 11-12‎, U.S. Army Air Forces, page 44

Any defense posture that he may have that would be common for any ballistic missile would not suffice for a low-altitude omnidirectional high-speed nuclear ramjet missile.

1962, Missiles and Rockets‎, American Aviation Publications, page 40

He’d known better at the time, damn it, but he’d let himself worry more over the possibility of losing an hour or two than her safety. He pounded his fists together and stared up at the sky with bitter eyes, but the alien stars mocked him, and his jaw clenched as he powered his com implant and sent out a full-powered omnidirectional pulse, heedless of the quarantine system’s sensors.

2003, David Weber, Empire from the Ashes‎, Baen Books, page 577