It can refer to the 24-hour period of time that it takes for the earth to rotate on its axis (e.g., “there are 24 hours in a day”).
Yaweza maanisha kipindi cha muda wa saa 24 ambao dunia inachukua mzunguko kwenye mhimili wake (kwa mfano, "kuna masaa 24 kwa siku").