दिक् जगह के उस विस्तार या फैलाव को कहते हैं जिसमें वस्तुओं का अस्तित्व होता है और घटनाएँ घटती हैं। मनुष्यों के नज़रिए से दिक् के तीन पहलू होते हैं, जिन्हें आयाम या डिमेन्शन भी कहते हैं - ऊपर-नीचे, आगे-पीछे और दाएँ-बाएँ।

Space is a three-dimensional continuum containing positions and directions. In classical physics, physical space is often conceived in three linear dimensions. Modern physicists usually consider it, with time, to be part of a boundless four-dimensional continuum known as spacetime. The concept of space is considered to be of fundamental importance to an understanding of the physical universe. However, disagreement continues between philosophers over whether it is itself an entity, a relationship between entities, or part of a conceptual framework.