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www.reference.com/article/mean-microscope-parfocal-d49f701201ffe9d2

Parfocal microscopes maintain focus throughout real-time magnification changes. These microscopes also remain focused when the user rotates objectives. This capability is a function of the lens and is a particularly popular feature on field microscopes. Parfocal lenses ...

www.reference.com/article/444-mean-ed8ac48a5a243ec2

In spiritual studies, 444 symbolizes angelic protection and divine messages. According to Doreen Virtue, author of "Angel Numbers," when an individual encounters the combination of 444, he is surrounded by multiple angels and there is nothing to fear.

www.reference.com/article/parfocal-lens-576cf066506b22fb

A parfocal lens is a zoom lens that holds its focus throughout its entire zoom range. A varifocal lens, on the other hand, is a zoom lens that requires the lens to be refocused if the focal length is changed.

www.reference.com/article/ip44-mean-5b4376fbd4c8eb49

IP44 refers to a type of lighting approved for use in some areas of the bathroom. The IP code stands for International Protection Rating, which is also called the Ingress Protection Rating.

www.reference.com/article/mean-human-1192d146337ebc85

Being human can mean many things, and it varies from person to person, but it is often summarized as a response to the human condition or as the condition itself. The human condition involves the problems arising from being a finite, conscious being.

www.reference.com/article/texting-mean-7381e1d160d885ce

"Texting" is short for text messaging, which is the act of sending a text message through mobile-to-mobile technology. As technology has advanced, the act of texting includes picture, video and audio messaging.

www.reference.com/article/federation-mean-77a261bd52b1150

A federation is a country with a united central government that is made up of separate units that each control its own internal affairs. The United States is one example of a federation.