English to English Dictionary

Oasis

A fertile or green spot in a desert, made so by the presence of water.

Obeisance

A deferential gesture, such as a bow or curtsy, expressing deep respect or reverence.

Obliged

Required or constrained by law, conscience, or force to do something.

Obliqueness

The state or quality of being neither parallel nor at a right angle to a specified or implied line; slanting or inclination.

Obscure

Not discovered or known about; uncertain.

Observatory

A room or building housing an astronomical telescope or other scientific equipment for the study of natural phenomena.

Observe

To watch carefully the way something happens or someone behaves.

Obsidian

A dark, glasslike volcanic rock that forms when lava cools rapidly without crystal growth.

Obsolete

No longer produced or used; out of date.

Occidental

Relating to the countries of the West, especially Europe and the Americas.

Odonate

Any predatory aquatic insect belonging to the order Odonata, comprising dragonflies and damselflies.

Offend

To cause to feel hurt, angry, or upset by rude or disrespectful behavior.